diff --git a/shortcuts/im/builders_test.go b/shortcuts/im/builders_test.go
index c32bd6a329..20963b86ed 100644
--- a/shortcuts/im/builders_test.go
+++ b/shortcuts/im/builders_test.go
@@ -317,6 +317,17 @@ func TestShortcutValidateBranches(t *testing.T) {
 		}
 	})
 
+	t.Run("ImChatSearch invalid chat-modes value", func(t *testing.T) {
+		runtime := newTestRuntimeContext(t, map[string]string{
+			"query":      "ok",
+			"chat-modes": "group,bogus",
+		}, nil)
+		err := ImChatSearch.Validate(context.Background(), runtime)
+		if err == nil || !strings.Contains(err.Error(), "invalid --chat-modes value") {
+			t.Fatalf("ImChatSearch.Validate() error = %v", err)
+		}
+	})
+
 	t.Run("ImChatUpdate requires fields", func(t *testing.T) {
 		runtime := newTestRuntimeContext(t, map[string]string{
 			"chat-id": "oc_123",
@@ -693,6 +704,39 @@ func TestShortcutDryRunShapes(t *testing.T) {
 		}
 	})
 
+	t.Run("ImChatSearch dry run maps chat-modes to wire values", func(t *testing.T) {
+		runtime := newTestRuntimeContext(t, map[string]string{
+			"query":      "team-alpha",
+			"chat-modes": "group,topic",
+		}, nil)
+		got := mustMarshalDryRun(t, ImChatSearch.DryRun(context.Background(), runtime))
+		if !strings.Contains(got, `"chat_modes":["default","thread"]`) {
+			t.Fatalf("ImChatSearch.DryRun() chat_modes mapping = %s", got)
+		}
+	})
+
+	t.Run("ImChatSearch dry run maps single chat-mode topic", func(t *testing.T) {
+		runtime := newTestRuntimeContext(t, map[string]string{
+			"query":      "team-alpha",
+			"chat-modes": "topic",
+		}, nil)
+		got := mustMarshalDryRun(t, ImChatSearch.DryRun(context.Background(), runtime))
+		if !strings.Contains(got, `"chat_modes":["thread"]`) {
+			t.Fatalf("ImChatSearch.DryRun() chat_modes mapping = %s", got)
+		}
+	})
+
+	t.Run("ImChatSearch dry run dedupes chat-modes", func(t *testing.T) {
+		runtime := newTestRuntimeContext(t, map[string]string{
+			"query":      "team-alpha",
+			"chat-modes": "group, group",
+		}, nil)
+		got := mustMarshalDryRun(t, ImChatSearch.DryRun(context.Background(), runtime))
+		if !strings.Contains(got, `"chat_modes":["default"]`) {
+			t.Fatalf("ImChatSearch.DryRun() chat_modes dedupe = %s", got)
+		}
+	})
+
 	t.Run("ImMessagesSearch dry run uses messages search endpoint", func(t *testing.T) {
 		runtime := newMessagesSearchTestRuntimeContext(t, map[string]string{
 			"query":      "incident",
diff --git a/shortcuts/im/im_chat_search.go b/shortcuts/im/im_chat_search.go
index bcb56afd17..8ee8032bfb 100644
--- a/shortcuts/im/im_chat_search.go
+++ b/shortcuts/im/im_chat_search.go
@@ -10,6 +10,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/larksuite/cli/errs"
 	"github.com/larksuite/cli/internal/output"
 	"github.com/larksuite/cli/internal/util"
 	"github.com/larksuite/cli/shortcuts/common"
@@ -30,6 +31,7 @@ var ImChatSearch = common.Shortcut{
 	Flags: []common.Flag{
 		{Name: "query", Desc: "search keyword (max 64 chars)"},
 		{Name: "search-types", Desc: "chat types, comma-separated (private, external, public_joined, public_not_joined)"},
+		{Name: "chat-modes", Desc: "filter by chat mode, comma-separated (group, topic)"},
 		{Name: "member-ids", Desc: "filter by member open_ids, comma-separated"},
 		{Name: "is-manager", Type: "bool", Desc: "only show chats you created or manage"},
 		{Name: "disable-search-by-user", Type: "bool", Desc: "disable search-by-member-name (default: search by member name first, then group name)"},
@@ -71,6 +73,13 @@ var ImChatSearch = common.Shortcut{
 				}
 			}
 		}
+		if cm := runtime.Str("chat-modes"); cm != "" {
+			for _, mode := range common.SplitCSV(cm) {
+				if mode != "group" && mode != "topic" {
+					return errs.NewValidationError(errs.SubtypeInvalidArgument, "invalid --chat-modes value %q: expected one of group, topic", mode).WithParam("--chat-modes")
+				}
+			}
+		}
 		if mi := runtime.Str("member-ids"); mi != "" {
 			ids := common.SplitCSV(mi)
 			if len(ids) > 50 {
@@ -216,6 +225,24 @@ func buildSearchChatBody(runtime *common.RuntimeContext) map[string]interface{}
 	if st := runtime.Str("search-types"); st != "" {
 		filter["search_types"] = common.SplitCSV(st)
 	}
+	// chat_modes is a server-side filter. The CLI exposes group/topic; the wire
+	// expects default/thread. Map and dedupe (the API caps the list at 2, and
+	// there are only 2 distinct modes) while preserving the user's order.
+	if cm := runtime.Str("chat-modes"); cm != "" {
+		seen := map[string]bool{}
+		var modes []string
+		for _, mode := range common.SplitCSV(cm) {
+			wire := map[string]string{"group": "default", "topic": "thread"}[mode]
+			if wire == "" || seen[wire] {
+				continue
+			}
+			seen[wire] = true
+			modes = append(modes, wire)
+		}
+		if len(modes) > 0 {
+			filter["chat_modes"] = modes
+		}
+	}
 	if mi := runtime.Str("member-ids"); mi != "" {
 		filter["member_ids"] = common.SplitCSV(mi)
 	}
diff --git a/skills/lark-im/references/lark-im-chat-search.md b/skills/lark-im/references/lark-im-chat-search.md
index 186bb70084..d5a7041996 100644
--- a/skills/lark-im/references/lark-im-chat-search.md
+++ b/skills/lark-im/references/lark-im-chat-search.md
@@ -15,6 +15,9 @@ lark-cli im +chat-search --query "project"
 # Restrict by search types
 lark-cli im +chat-search --query "project" --search-types "private,public_joined"
 
+# Filter by chat mode (group = regular group, topic = topic/thread group)
+lark-cli im +chat-search --query "project" --chat-modes "topic"
+
 # Filter by member open_ids (with keyword)
 lark-cli im +chat-search --query "project" --member-ids "ou_xxx,ou_yyy"
 
@@ -43,6 +46,7 @@ lark-cli im +chat-search --query "project" --dry-run
 |------|------|------|------|
 | `--query <keyword>` | No (at least one of `--query` / `--member-ids` required) | Max 64 characters | Search keyword. Supports matching localized chat names, member names, multilingual search, pinyin, and prefix fuzzy search. If the query contains `-`, it is automatically wrapped in quotes |
 | `--search-types <types>` | No | Comma-separated: `private`, `external`, `public_joined`, `public_not_joined` | Restrict the visible chat types returned by search |
+| `--chat-modes <modes>` | No | Comma-separated: `group`, `topic` | Filter by chat mode (server-side): `group` = regular group, `topic` = topic/thread group |
 | `--member-ids <ids>` | No (at least one of `--query` / `--member-ids` required) | Up to 50, format `ou_xxx` | Filter by member open_ids; can be used alone or combined with `--query` |
 | `--is-manager` | No | - | Only show chats you created or manage |
 | `--disable-search-by-user` | No | - | Disable member-name-based matching and search by group name only |