diff --git a/internal/pkg/cache/cache.go b/internal/pkg/cache/cache.go
index 9157658..bb5409e 100644
--- a/internal/pkg/cache/cache.go
+++ b/internal/pkg/cache/cache.go
@@ -124,6 +124,9 @@ func (a *Arch) getArchiveCache(ctx context.Context) []models.PostArchive {
 	return a.data
 }
 
+// CategoriesTags categories or tags
+//
+// t is constraints.Tag or constraints.Category
 func CategoriesTags(ctx context.Context, t ...int) []models.TermsMy {
 	r, err := categoryAndTagsCaches.GetCache(ctx, time.Second, ctx)
 	logs.ErrPrintln(err, "get category err")
diff --git a/internal/pkg/constraints/widgets/constraints.go b/internal/pkg/constraints/widgets/constraints.go
index c978f70..37794b3 100644
--- a/internal/pkg/constraints/widgets/constraints.go
+++ b/internal/pkg/constraints/widgets/constraints.go
@@ -5,4 +5,5 @@ const (
 	RecentPostsArgs    = "RecentPostsArgs"
 	RecentCommentsArgs = "RecentCommentsArgs"
 	ArchiveArgs        = "ArchiveArgs"
+	Categories         = "Categories"
 )
diff --git a/internal/theme/twentyfifteen/twentyfifteen.go b/internal/theme/twentyfifteen/twentyfifteen.go
index 5ab6ebb..af9f0e9 100644
--- a/internal/theme/twentyfifteen/twentyfifteen.go
+++ b/internal/theme/twentyfifteen/twentyfifteen.go
@@ -10,6 +10,7 @@ import (
 	"github.com/fthvgb1/wp-go/internal/plugins/wphandle"
 	"github.com/fthvgb1/wp-go/internal/theme/wp"
 	"github.com/fthvgb1/wp-go/internal/theme/wp/components"
+	"github.com/fthvgb1/wp-go/internal/theme/wp/components/widget"
 	"strings"
 )
 
@@ -33,7 +34,7 @@ func Init(fs embed.FS) {
 	logs.ErrPrintln(err, "解析colorscheme失败")
 }
 
-var pipe = wp.HandlePipe(wp.Render, dispatch)
+var pipe = wp.HandlePipe(wp.Render, widget.IsCategory, dispatch)
 
 func Hook(h *wp.Handle) {
 	pipe(h)
diff --git a/internal/theme/wp/components/widget/category.go b/internal/theme/wp/components/widget/category.go
index 4a6f69a..5068bec 100644
--- a/internal/theme/wp/components/widget/category.go
+++ b/internal/theme/wp/components/widget/category.go
@@ -12,6 +12,7 @@ import (
 	"github.com/fthvgb1/wp-go/internal/theme/wp"
 	"github.com/fthvgb1/wp-go/internal/wpconfig"
 	"github.com/fthvgb1/wp-go/safety"
+	"net/http"
 	"strings"
 )
 
@@ -25,18 +26,23 @@ var categoryConfig = func() safety.Var[map[any]any] {
 		"title":        "分类",
 	})
 	categoryArgs.Store(map[string]string{
-		"{$before_widget}":  `<aside id="categories-2" class="widget widget_categories">`,
-		"{$after_widget}":   "</aside>",
-		"{$before_title}":   `<h2 class="widget-title">`,
-		"{$after_title}":    "</h2>",
-		"{$before_sidebar}": "",
-		"{$after_sidebar}":  "",
-		"{$nav}":            "",
-		"{$navCloser}":      "",
-		"{$title}":          "",
-		"{$dropdown_id}":    "archives-dropdown-2",
-		"{$dropdown_type}":  "monthly",
-		"{$dropdown_label}": "选择月份",
+		"{$before_widget}":    `<aside id="categories-2" class="widget widget_categories">`,
+		"{$after_widget}":     "</aside>",
+		"{$before_title}":     `<h2 class="widget-title">`,
+		"{$after_title}":      "</h2>",
+		"{$before_sidebar}":   "",
+		"{$after_sidebar}":    "",
+		"{$class}":            "postform",
+		"{$show_option_none}": "选择分类",
+		"{$name}":             "cat",
+		"{$id}":               "cat",
+		"{$required}":         "",
+		"{$nav}":              "",
+		"{$navCloser}":        "",
+		"{$title}":            "",
+		"{$dropdown_id}":      "archives-dropdown-2",
+		"{$dropdown_type}":    "monthly",
+		"{$dropdown_label}":   "选择月份",
 	})
 	return v
 }()
@@ -50,7 +56,7 @@ var categoryTemplate = `{$before_widget}
 `
 
 func Category(h *wp.Handle) string {
-	args := wp.GetComponentsArgs(h, widgets.ArchiveArgs, categoryArgs.Load())
+	args := wp.GetComponentsArgs(h, widgets.Categories, categoryArgs.Load())
 	args = maps.FilterZeroMerge(categoryArgs.Load(), args)
 	conf := wpconfig.GetPHPArrayVal("widget_categories", categoryConfig.Load(), int64(2))
 	conf = maps.FilterZeroMerge(categoryConfig.Load(), conf)
@@ -59,6 +65,7 @@ func Category(h *wp.Handle) string {
 	dropdown := conf["dropdown"].(int64)
 	categories := cache.CategoriesTags(h.C, constraints.Category)
 	if dropdown == 1 {
+		t = strings.ReplaceAll(t, "{$html}", categoryDropdown(h, args, conf, categories))
 
 	} else {
 		t = strings.ReplaceAll(t, "{$html}", categoryUL(h, args, conf, categories))
@@ -87,3 +94,92 @@ func categoryUL(h *wp.Handle, args map[string]string, conf map[any]any, categori
 	s.WriteString("</ul>")
 	return s.String()
 }
+
+var categoryDropdownJs = `/* <![CDATA[ */
+(function() {
+	var dropdown = document.getElementById( "%s" );
+	function onCatChange() {
+		if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {
+			dropdown.parentNode.submit();
+		}
+	}
+	dropdown.onchange = onCatChange;
+})();
+/* ]]> */
+`
+
+func categoryDropdown(h *wp.Handle, args map[string]string, conf map[any]any, categories []models.TermsMy) string {
+	s := str.NewBuilder()
+	s.WriteString(`<form action="/" method="get">
+`)
+	s.Sprintf(`	<label class="screen-reader-text" for="%s">%s</label>
+`, args["{$id}"], args["{$title}"])
+	if len(categories) > 0 {
+		s.Sprintf(`	<select %s name="%s" id="%s" class="%s">
+`, args["{$required}"], args["{$name}"], args["{$id}"], args["{$class}"])
+		s.Sprintf(`		<option value="%[1]s">%[1]s</option>
+`, args["{$show_option_none}"])
+		currentCategory := ""
+		if h.Scene() == constraints.Category {
+			currentCategory = h.Index.Param.Category
+		}
+		showCount := conf["count"].(int64)
+		for _, category := range categories {
+			selected := ""
+			if category.Name == currentCategory {
+				selected = "selected"
+			}
+			count := ""
+			if showCount != 0 {
+				count = fmt.Sprintf("(%d)", category.Count)
+			}
+			s.Sprintf(`		<option %s value="%d">%s %s</option>
+`, selected, category.Terms.TermId, category.Name, count)
+		}
+		s.WriteString("	</select>\n")
+	}
+	s.WriteString("</form>\n")
+	attr := ""
+	if !slice.IsContained(h.CommonThemeMods().ThemeSupport.HTML5, "script") {
+		attr = ` type="text/javascript"`
+	}
+	s.Sprintf(`<script%s>
+`, attr)
+	s.Sprintf(categoryDropdownJs, args["{$id}"])
+	s.WriteString("</script>\n")
+	return s.String()
+}
+
+func IsCategory(next wp.HandleFn[*wp.Handle], h *wp.Handle) {
+	if h.Scene() != constraints.Home {
+		next(h)
+		return
+	}
+	name, ok := parseDropdownCate(h)
+	if !ok {
+		next(h)
+		return
+	}
+	h.C.Redirect(http.StatusMovedPermanently, fmt.Sprintf("/p/category/%s", name))
+}
+
+func parseDropdownCate(h *wp.Handle) (cateName string, r bool) {
+	cate := wp.GetComponentsArgs[map[string]string](h, widgets.Categories, categoryArgs.Load())
+	name, ok := cate["{$name}"]
+	if !ok || name == "" {
+		return
+	}
+	cat := h.C.Query(name)
+	if cat == "" {
+		return
+	}
+	cates := slice.SimpleToMap(cache.CategoriesTags(h.C, constraints.Category), func(v models.TermsMy) uint64 {
+		return v.Terms.TermId
+	})
+	cc, r := cates[str.ToInteger[uint64](cat, 0)]
+	if !r {
+		return
+	}
+	cateName = cc.Name
+	return
+}