diff --git a/internal/service/media_listing.go b/internal/service/media_listing.go
index edb0e6b..55a9975 100644
--- a/internal/service/media_listing.go
+++ b/internal/service/media_listing.go
@@ -2,7 +2,6 @@ package service
 
 import (
 	"context"
-	"sort"
 	"strings"
 	"time"
 
@@ -179,9 +178,18 @@ func (s *MediaService) listVersionSiblings(ctx context.Context, media *model.Med
 		libraryIDs = []string{media.LibraryID}
 	}
 	filter := repository.MediaQueryFilter{IncludeNSFW: true}
-	candidates, narrowed, err := s.repo.Media.ListVersionCandidates(ctx, libraryIDs, *media, 5000)
-	if err != nil {
-		return nil, err
+	// 成人条目按番号分组，而番号常常只存在于路径/标题里：本地 NFO 来源的分片
+	// 没有 douban_id/thetvdb_id（MetaTube 刮削出来的那几个才有）。若仍按外部
+	// ID 预先收窄候选集，同番号的其它分片会被 SQL 直接排除，表现就是库里折叠
+	// 出了 N 个版本、详情页却只列出带 ID 的那几个。因此成人条目不预先收窄，
+	// 直接在该库范围内比对版本键。
+	var candidates []model.Media
+	narrowed := false
+	if mediaAdultGroupCode(*media) == "" {
+		candidates, narrowed, err = s.repo.Media.ListVersionCandidates(ctx, libraryIDs, *media, 5000)
+		if err != nil {
+			return nil, err
+		}
 	}
 	if !narrowed {
 		candidates, err = s.repo.Media.ListByLibrariesFilteredNoCount(ctx, libraryIDs, 0, 5000, filter)
@@ -199,14 +207,6 @@ func (s *MediaService) listVersionSiblings(ctx context.Context, media *model.Med
 	if len(matched) == 0 {
 		return []model.Media{*media}, nil
 	}
-	sort.SliceStable(matched, func(i, j int) bool {
-		if matched[i].ID == media.ID {
-			return true
-		}
-		if matched[j].ID == media.ID {
-			return false
-		}
-		return betterMediaVersion(matched[i], matched[j])
-	})
+	sortMediaVersionsForDisplay(matched)
 	return matched, nil
 }
diff --git a/internal/service/media_versions.go b/internal/service/media_versions.go
index 5eb038b..8d5d590 100644
--- a/internal/service/media_versions.go
+++ b/internal/service/media_versions.go
@@ -3,6 +3,7 @@ package service
 import (
 	"fmt"
 	"path/filepath"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -77,34 +78,28 @@ func groupMediaVersions(items []model.Media) []MediaItem {
 		return nil
 	}
 	type group struct {
-		key     string
-		primary model.Media
-		rows    []model.Media
+		key  string
+		rows []model.Media
 	}
 	groups := make([]group, 0, len(items))
 	byKey := make(map[string]int, len(items))
 	for _, item := range items {
 		key := mediaVersionGroupKey(item)
 		if key == "" {
-			groups = append(groups, group{primary: item, rows: []model.Media{item}})
+			groups = append(groups, group{rows: []model.Media{item}})
 			continue
 		}
 		if idx, ok := byKey[key]; ok {
 			groups[idx].rows = append(groups[idx].rows, item)
-			if betterMediaVersion(item, groups[idx].primary) {
-				groups[idx].primary = item
-			}
 			continue
 		}
 		byKey[key] = len(groups)
-		groups = append(groups, group{key: key, primary: item, rows: []model.Media{item}})
+		groups = append(groups, group{key: key, rows: []model.Media{item}})
 	}
 	out := make([]MediaItem, 0, len(groups))
 	for _, g := range groups {
-		sort.SliceStable(g.rows, func(i, j int) bool {
-			return betterMediaVersion(g.rows[i], g.rows[j])
-		})
-		item := MediaItem{Media: g.primary}
+		sortMediaVersionsForDisplay(g.rows)
+		item := MediaItem{Media: g.rows[0]}
 		if len(g.rows) > 1 {
 			item.Versions = g.rows
 		}
@@ -351,8 +346,11 @@ func mediaVersionFileStem(name string) string {
 }
 
 // MediaVersionLabel 生成版本切换展示名（分辨率 / 容器 / 编码 / 体积 / 文件名）。
+// 当只有容器等无法区分多版本的信息时，回退到清理后的文件名。
 func MediaVersionLabel(m model.Media) string {
 	parts := make([]string, 0, 4)
+	isStrm := strings.HasSuffix(strings.ToLower(strings.TrimSpace(m.Path)), ".strm") ||
+		strings.TrimSpace(m.STRMURL) != ""
 	if m.Height > 0 {
 		parts = append(parts, fmt.Sprintf("%dp", m.Height))
 	} else if m.Width > 0 {
@@ -368,17 +366,91 @@ func MediaVersionLabel(m model.Media) string {
 	if codec := strings.TrimSpace(m.VideoCodec); codec != "" {
 		parts = append(parts, strings.ToUpper(codec))
 	}
-	if m.SizeBytes > 0 {
+	// STRM 占位体积（通常几十到几百字节）不能区分分片，跳过。
+	placeholderSize := isStrm && m.SizeBytes > 0 && m.SizeBytes < 1024*1024
+	if m.SizeBytes > 0 && !placeholderSize {
 		parts = append(parts, formatMediaSize(m.SizeBytes))
 	}
-	if len(parts) > 0 {
+	if len(parts) > 0 && !mediaVersionLabelIndistinct(parts) {
 		return strings.Join(parts, " · ")
 	}
-	base := filepath.Base(strings.ReplaceAll(strings.TrimSpace(m.Path), "\\", "/"))
-	if base == "" || base == "." {
-		return firstNonEmpty(m.Title, m.OriginalName, m.ID)
+	if cleaned := cleanMediaVersionFilename(m.Path); cleaned != "" {
+		return cleaned
 	}
-	return base
+	return firstNonEmpty(m.Title, m.OriginalName, m.ID)
+}
+
+func mediaVersionLabelIndistinct(parts []string) bool {
+	if len(parts) == 0 {
+		return true
+	}
+	for _, part := range parts {
+		upper := strings.ToUpper(strings.TrimSpace(part))
+		if upper == "" || upper == "云端直链" || upper == "STRM" {
+			continue
+		}
+		if _, ok := videoExtensions["."+strings.ToLower(upper)]; ok {
+			continue
+		}
+		return false
+	}
+	return true
+}
+
+func cleanMediaVersionFilename(path string) string {
+	base := filepath.Base(strings.ReplaceAll(strings.TrimSpace(path), "\\", "/"))
+	if base == "" || base == "." {
+		return ""
+	}
+	stem := mediaFileStem(base)
+	stem = strings.ReplaceAll(stem, "_", " ")
+	stem = strings.ReplaceAll(stem, ".", " ")
+	return strings.Join(strings.Fields(stem), " ")
+}
+
+// mediaPartNumber 从路径提取分片序号（part1 / cd2 / -3）。
+// 裸后缀只认 1–2 位数字，避免把年份 2024 当成 part。
+func mediaPartNumber(path string) (int, bool) {
+	stem := mediaFileStem(filepath.Base(strings.ReplaceAll(strings.TrimSpace(path), "\\", "/")))
+	if stem == "" {
+		return 0, false
+	}
+	lower := strings.ToLower(stem)
+	for _, re := range mediaPartNumberPatterns {
+		if m := re.FindStringSubmatch(lower); len(m) == 2 {
+			n, err := strconv.Atoi(m[1])
+			if err == nil && n > 0 {
+				return n, true
+			}
+		}
+	}
+	return 0, false
+}
+
+var mediaPartNumberPatterns = []*regexp.Regexp{
+	regexp.MustCompile(`(?:^|[.\-_])part[\s._-]*(\d{1,3})$`),
+	regexp.MustCompile(`(?:^|[.\-_])(?:cd|disc|disk)[\s._-]*(\d{1,3})$`),
+	regexp.MustCompile(`[-_](\d{1,2})$`),
+}
+
+func sortMediaVersionsForDisplay(rows []model.Media) {
+	sort.SliceStable(rows, func(i, j int) bool {
+		return compareMediaVersionsForDisplay(rows[i], rows[j])
+	})
+}
+
+// compareMediaVersionsForDisplay：有分片号时按 1→2→3… 升序；否则按画质/体积择优。
+func compareMediaVersionsForDisplay(a, b model.Media) bool {
+	pa, oka := mediaPartNumber(a.Path)
+	pb, okb := mediaPartNumber(b.Path)
+	if oka && okb {
+		if pa != pb {
+			return pa < pb
+		}
+	} else if oka != okb {
+		return oka
+	}
+	return betterMediaVersion(a, b)
 }
 
 func mediaVersionContainerFromPath(path, strmURL string) string {
diff --git a/internal/service/media_versions_test.go b/internal/service/media_versions_test.go
index e3ab742..752b121 100644
--- a/internal/service/media_versions_test.go
+++ b/internal/service/media_versions_test.go
@@ -443,6 +443,88 @@ func TestMediaVersionLabelUsesContainerAndSize(t *testing.T) {
 	}
 }
 
+func TestMediaPartNumberFromPath(t *testing.T) {
+	cases := []struct {
+		path string
+		want int
+		ok   bool
+	}{
+		{"/media/云下载/ipvr00192pl/fbzip.com@ipvr00192.part1.strm", 1, true},
+		{"/media/云下载/ipvr00192pl/fbzip.com@ipvr00192.part2.strm", 2, true},
+		{"/media/云下载/sivr-270/sivr-270-1.strm", 1, true},
+		{"/media/云下载/sivr-270/sivr-270-7.strm", 7, true},
+		{"/media/云下载/fc2/FC2PPV-4701981-cd2.strm", 2, true},
+		{"/media/Movies/Inception.2010.1080p.BluRay.x264.mkv", 0, false},
+		{"/media/Movies/Movie.2024.mkv", 0, false},
+	}
+	for _, tc := range cases {
+		got, ok := mediaPartNumber(tc.path)
+		if ok != tc.ok || got != tc.want {
+			t.Fatalf("mediaPartNumber(%q) = (%d, %v), want (%d, %v)", tc.path, got, ok, tc.want, tc.ok)
+		}
+	}
+}
+
+func TestGroupMediaVersionsSortsPartsAscending(t *testing.T) {
+	rows := []model.Media{
+		{
+			Base:      model.Base{ID: "p3"},
+			LibraryID: "cloud",
+			Title:     "SIVR-270",
+			Path:      "/media/云下载/sivr-270/sivr-270-3.strm",
+			Year:      2023,
+			NSFW:      true,
+			SizeBytes: 300,
+		},
+		{
+			Base:      model.Base{ID: "p1"},
+			LibraryID: "cloud",
+			Title:     "SIVR-270",
+			Path:      "/media/云下载/sivr-270/sivr-270-1.strm",
+			Year:      2023,
+			NSFW:      true,
+			SizeBytes: 100,
+		},
+		{
+			Base:      model.Base{ID: "p2"},
+			LibraryID: "cloud",
+			Title:     "SIVR-270",
+			Path:      "/media/云下载/sivr-270/sivr-270-2.strm",
+			Year:      2023,
+			NSFW:      true,
+			SizeBytes: 200,
+		},
+	}
+	grouped := groupMediaVersions(rows)
+	if len(grouped) != 1 || len(grouped[0].Versions) != 3 {
+		t.Fatalf("grouped = %#v", grouped)
+	}
+	want := []string{"p1", "p2", "p3"}
+	for i, id := range want {
+		if grouped[0].Versions[i].ID != id {
+			t.Fatalf("versions[%d] = %q, want %q (order %#v)", i, grouped[0].Versions[i].ID, id, grouped[0].Versions)
+		}
+	}
+	if grouped[0].ID != "p1" {
+		t.Fatalf("primary = %q, want p1 (first part)", grouped[0].ID)
+	}
+}
+
+func TestMediaVersionLabelFallsBackToFilenameWhenIndistinct(t *testing.T) {
+	label := MediaVersionLabel(model.Media{
+		Title:     "SIVR-270-【VR】河北彩花",
+		Path:      "/media/云下载/sivr-270/sivr-270-1.strm",
+		SizeBytes: 157,
+		STRMURL:   "/api/strm/play/cloud115/video.mp4?pickcode=a",
+	})
+	if !strings.Contains(label, "sivr-270-1") {
+		t.Fatalf("indistinct strm label should fall back to filename, got %q", label)
+	}
+	if strings.EqualFold(label, "MP4") || strings.Contains(label, "云端") {
+		t.Fatalf("should not keep generic-only label %q", label)
+	}
+}
+
 // SIVR-270 现场：一部分分片走在线刮削（MetaTube 把番号/provider 借用进
 // douban_id/thetvdb_id），另一部分只从本地 NFO 拿到标题（没有外部 ID）。
 // 按外部 ID 分组会把它们裂成两张标题完全相同的卡，必须按番号折成一张。
@@ -566,6 +648,58 @@ func TestGroupMediaVersionsMergesAdultPartsWithBorrowedMetaTubeIDs(t *testing.T)
 	if len(grouped[0].Versions) != 2 {
 		t.Fatalf("versions len = %d, want 2", len(grouped[0].Versions))
 	}
+	if grouped[0].Versions[0].ID != "ipvr-00192-part1" || grouped[0].Versions[1].ID != "ipvr-00192-part2" {
+		t.Fatalf("versions should be part1 then part2, got %#v", grouped[0].Versions)
+	}
+}
+
+func TestGetMediaItemListsAdultVersionsAcrossMetadataSources(t *testing.T) {
+	db := newServiceTestDB(t, &model.Library{}, &model.Media{})
+	repos := repository.New(db)
+	lib := model.Library{Name: "云下载", Path: "/media/云下载", Type: "movie", Enabled: true}
+	if err := repos.Library.Create(t.Context(), &lib); err != nil {
+		t.Fatal(err)
+	}
+	rows := []model.Media{
+		{
+			// 走 MetaTube 刮削的分片：番号/provider 被借用进 douban/thetvdb。
+			LibraryID:    lib.ID,
+			Title:        "SIVR-270-【VR】河北彩花",
+			OriginalName: "SIVR-270",
+			Path:         "/media/云下载/sivr-270/sivr-270-1.strm",
+			Year:         2023,
+			NSFW:         true,
+			DoubanID:     "SIVR-270",
+			TheTVDBID:    "JavBus",
+			ScrapeStatus: "matched",
+			SizeBytes:    200,
+		},
+		{
+			// 只有本地 NFO 身份的分片：两个外部 ID 都为空。
+			LibraryID:    lib.ID,
+			Title:        "SIVR-270-【VR】河北彩花",
+			OriginalName: "SIVR-270",
+			Path:         "/media/云下载/sivr-270/sivr-270-4.strm",
+			Year:         2023,
+			NSFW:         true,
+			ScrapeStatus: "matched",
+			SizeBytes:    100,
+		},
+	}
+	if err := db.Create(&rows).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewMediaService(&config.Config{}, zap.NewNop(), repos).
+		SetRuntimeCache(NewRuntimeCacheService(&config.Config{}, zap.NewNop()))
+	item, err := svc.GetMediaItem(t.Context(), rows[0].ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if item == nil || len(item.Versions) != 2 {
+		// 详情页版本列表不能只按外部 ID 收窄，否则没有 ID 的分片会消失。
+		t.Fatalf("versions = %#v, want both parts", item)
+	}
 }
 
 func TestMediaAdultGroupCodeRequiresNSFW(t *testing.T) {
diff --git a/web/src/utils/mediaVersion.test.ts b/web/src/utils/mediaVersion.test.ts
new file mode 100644
index 0000000..2696f0c
--- /dev/null
+++ b/web/src/utils/mediaVersion.test.ts
@@ -0,0 +1,44 @@
+import { mediaVersionLabel } from './mediaVersion.ts'
+import type { Media } from '../types/index.ts'
+
+function check(name: string, condition: boolean) {
+  if (!condition) throw new Error(`mediaVersion: ${name}`)
+}
+
+function media(partial: Partial<Media>): Media {
+  return {
+    id: 'm1',
+    title: 'SIVR-270',
+    path: '',
+    height: 0,
+    width: 0,
+    size_bytes: 0,
+    ...partial,
+  } as Media
+}
+
+const partLabel = mediaVersionLabel(media({
+  path: '/media/云下载/sivr-270/sivr-270-1.strm',
+  size_bytes: 157,
+  strm_url: '/api/strm/play/cloud115/video.mp4?pickcode=a',
+}))
+check('indistinct strm falls back to filename', partLabel.includes('sivr-270-1'))
+check('indistinct strm is not generic MP4 only', partLabel.toUpperCase() !== 'MP4')
+
+const richLabel = mediaVersionLabel(media({
+  path: '/strm/竞女01.mkv.strm',
+  height: 1080,
+  size_bytes: 1024 * 1024 * 1200,
+  strm_url: '/api/strm/play/cloud115/video.mkv?pickcode=a',
+}))
+check('rich metadata keeps resolution label', richLabel.includes('1080p'))
+check('rich metadata keeps container', richLabel.toUpperCase().includes('MKV'))
+
+const dottedPart = mediaVersionLabel(media({
+  path: '/media/云下载/ipvr00192pl/fbzip.com@ipvr00192.part2.strm',
+  size_bytes: 157,
+  strm_url: '/api/strm/play/cloud115/video.mp4?pickcode=b',
+}))
+check('part2 filename fallback keeps part token', dottedPart.includes('part2'))
+
+console.log('mediaVersion.test.ts: ok')
diff --git a/web/src/utils/mediaVersion.ts b/web/src/utils/mediaVersion.ts
index 26fbbea..599220e 100644
--- a/web/src/utils/mediaVersion.ts
+++ b/web/src/utils/mediaVersion.ts
@@ -107,6 +107,15 @@ function cleanFallbackFilename(raw: string): string {
   return name
 }
 
+function isIndistinctVersionLabel(parts: string[]): boolean {
+  if (parts.length === 0) return true
+  return parts.every((part) => {
+    const upper = part.toUpperCase()
+    if (upper === '云端直链' || upper === 'STRM') return true
+    return VIDEO_EXTENSIONS.has(part.toLowerCase())
+  })
+}
+
 /** 版本切换展示名：分辨率 · 容器 · 编码 · 体积 / 规格 / 来源标签。 */
 export function mediaVersionLabel(media: Media): string {
   const isStrm = isStrmMedia(media)
@@ -153,11 +162,11 @@ export function mediaVersionLabel(media: Media): string {
     parts.push('云端直链')
   }
 
-  if (parts.length > 0) {
+  // 只有容器 /「云端直链」时无法区分多分片，回退文件名（sivr-270-1 / …part1）
+  if (parts.length > 0 && !isIndistinctVersionLabel(parts)) {
     return parts.join(' · ')
   }
 
-  // 兜底：使用清理后的文件名
   const cleaned = cleanFallbackFilename(media.path || '')
   return cleaned || media.title || media.id
 }