diff --git a/doc/changes/repo-tree-default-branch.md b/doc/changes/repo-tree-default-branch.md
index 0bd9e05..29c8a64 100644
--- a/doc/changes/repo-tree-default-branch.md
+++ b/doc/changes/repo-tree-default-branch.md
@@ -16,3 +16,10 @@
 
 - `go test ./shortcuts/repo/`（默认 ref 断言改为「不携带 ref 参数」）
 - 生产 gitlink.org.cn 实测：默认分支为 `main` 与 `master` 的仓库均正常列出根目录。
+
+## 追加：branch/pr/release 同类问题一并修复
+
+- 新增 `RuntimeContext.DefaultBranch()`：读取仓库详情的 `default_branch`（缺失时回退 master）
+- `branch +create --from` / `pr +create --base` 未指定时回退到仓库默认分支（不再硬编码 master）
+- `release +create --target` 未指定时省略 `target_commitish`（平台自动落默认分支）
+- 生产实测（默认分支为 main 的仓库）：`repo +tree` / `branch +create` / `release +create` 均成功
diff --git a/shortcuts/branch/branch.go b/shortcuts/branch/branch.go
index 0393ad5..e96cf26 100644
--- a/shortcuts/branch/branch.go
+++ b/shortcuts/branch/branch.go
@@ -37,7 +37,7 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 			Description: tr.T("cmd.branch.create.short"),
 			Flags: []common.Flag{
 				{Name: "name", Short: "n", Usage: tr.T("flag.branch.name"), Required: true},
-				{Name: "from", Short: "f", Usage: tr.T("flag.branch.from"), Default: "master"},
+				{Name: "from", Short: "f", Usage: tr.T("flag.branch.from")},
 			},
 			Run: func(ctx *common.RuntimeContext) error {
 				if err := ctx.ResolveOwnerRepo(); err != nil {
@@ -46,7 +46,10 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				name, _ := ctx.RequireArg("name")
 				from := ctx.Arg("from")
 				if from == "" {
-					from = "master"
+					var err error
+					if from, err = ctx.DefaultBranch(); err != nil {
+						return err
+					}
 				}
 				payload := map[string]interface{}{
 					"new_branch_name": name,
diff --git a/shortcuts/branch/branch_test.go b/shortcuts/branch/branch_test.go
index 1f1908f..b99d68b 100644
--- a/shortcuts/branch/branch_test.go
+++ b/shortcuts/branch/branch_test.go
@@ -81,12 +81,23 @@ func TestBranchCreate(t *testing.T) {
 }
 
 func TestBranchCreateDefaultFrom(t *testing.T) {
-	// When 'from' is not set, it defaults to "master"
+	// When 'from' is not set, it falls back to the repository default branch.
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		if r.URL.Path != "/v1/owner/repo/branches.json" {
+		switch r.URL.Path {
+		case "/owner/repo.json":
+			writeJSON(w, map[string]interface{}{"default_branch": "main"})
+		case "/v1/owner/repo/branches.json":
+			var payload map[string]interface{}
+			if err := json.NewDecoder(r.Body).Decode(&payload); err != nil {
+				t.Fatalf("decode payload: %v", err)
+			}
+			if payload["old_branch_name"] != "main" {
+				t.Fatalf("expected old_branch_name to be default branch main, got %v", payload["old_branch_name"])
+			}
+			writeJSON(w, map[string]interface{}{"name": "feature-y"})
+		default:
 			t.Fatalf("unexpected path: %s", r.URL.Path)
 		}
-		writeJSON(w, map[string]interface{}{"name": "feature-y"})
 	}))
 	defer server.Close()
 
diff --git a/shortcuts/common/types.go b/shortcuts/common/types.go
index 87a052a..ffd4338 100644
--- a/shortcuts/common/types.go
+++ b/shortcuts/common/types.go
@@ -105,6 +105,20 @@ func (ctx *RuntimeContext) OutputData(data interface{}) error {
 	return output.Print(output.SuccessEnvelope(data, nil), ctx.Format)
 }
 
+// DefaultBranch fetches the repository's default branch, falling back to "master".
+func (ctx *RuntimeContext) DefaultBranch() (string, error) {
+	env, err := ctx.CallAPI("GET", ctx.RepoPath(), nil)
+	if err != nil {
+		return "", err
+	}
+	if data, ok := env.Data.(map[string]interface{}); ok {
+		if branch, ok := data["default_branch"].(string); ok && branch != "" {
+			return branch, nil
+		}
+	}
+	return "master", nil
+}
+
 // RepoPath returns the API path prefix for the current owner/repo.
 func (ctx *RuntimeContext) RepoPath() string {
 	return fmt.Sprintf("/%s/%s", ctx.Owner, ctx.Repo)
diff --git a/shortcuts/pr/pr.go b/shortcuts/pr/pr.go
index 03f537f..d9cba36 100644
--- a/shortcuts/pr/pr.go
+++ b/shortcuts/pr/pr.go
@@ -96,7 +96,7 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				{Name: "title", Short: "t", Usage: tr.T("flag.pr.title"), Required: true},
 				{Name: "body", Short: "b", Usage: tr.T("flag.pr.body")},
 				{Name: "head", Usage: tr.T("flag.pr.head"), Required: true},
-				{Name: "base", Usage: tr.T("flag.pr.base"), Default: "master"},
+				{Name: "base", Usage: tr.T("flag.pr.base")},
 			},
 			Run: func(ctx *common.RuntimeContext) error {
 				if err := ctx.ResolveOwnerRepo(); err != nil {
@@ -106,7 +106,10 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				head, _ := ctx.RequireArg("head")
 				base := ctx.Arg("base")
 				if base == "" {
-					base = "master"
+					var err error
+					if base, err = ctx.DefaultBranch(); err != nil {
+						return err
+					}
 				}
 				payload := map[string]interface{}{
 					"title": title,
diff --git a/shortcuts/pr/pr_test.go b/shortcuts/pr/pr_test.go
index eece6d9..7b28251 100644
--- a/shortcuts/pr/pr_test.go
+++ b/shortcuts/pr/pr_test.go
@@ -209,6 +209,10 @@ func TestPRCreate(t *testing.T) {
 func TestPRCreateNoBody(t *testing.T) {
 	var payload map[string]interface{}
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/owner/repo.json" {
+			writeJSON(t, w, map[string]interface{}{"default_branch": "main"})
+			return
+		}
 		payload = decodeJSON(t, r)
 		writeJSON(t, w, map[string]interface{}{"id": float64(43), "title": "feat: nob"})
 	}))
@@ -224,6 +228,9 @@ func TestPRCreateNoBody(t *testing.T) {
 	if _, ok := payload["body"]; ok {
 		t.Fatal("body should not be in payload when not provided")
 	}
+	if payload["base"] != "main" {
+		t.Fatalf("expected base to fall back to default branch main, got %v", payload["base"])
+	}
 }
 
 // --- view ---
diff --git a/shortcuts/release/release.go b/shortcuts/release/release.go
index 21d7ec4..301abb0 100644
--- a/shortcuts/release/release.go
+++ b/shortcuts/release/release.go
@@ -42,7 +42,7 @@ func Shortcuts(translators ...*i18n.Translator) []*common.Shortcut {
 				{Name: "tag", Short: "t", Usage: tr.T("flag.release.tag"), Required: true},
 				{Name: "name", Short: "n", Usage: tr.T("flag.release.name"), Required: true},
 				{Name: "body", Short: "b", Usage: tr.T("flag.release.body")},
-				{Name: "target", Usage: tr.T("flag.release.target"), Default: "master"},
+				{Name: "target", Usage: tr.T("flag.release.target")},
 				{Name: "prerelease", Usage: tr.T("flag.release.prerelease"), Default: "false"},
 				{Name: "draft", Usage: "Mark as draft (true/false)", Default: "false"},
 				{Name: "attachment-ids", Usage: "Comma-separated attachment IDs"},