diff --git a/apps/desktop/src/components/sidebar/SidebarTreeRuntimeHost.vue b/apps/desktop/src/components/sidebar/SidebarTreeRuntimeHost.vue
index 894ab3bbe6..f2137045de 100644
--- a/apps/desktop/src/components/sidebar/SidebarTreeRuntimeHost.vue
+++ b/apps/desktop/src/components/sidebar/SidebarTreeRuntimeHost.vue
@@ -202,7 +202,7 @@ import { savedSqlClipboardFileIds, savedSqlPasteTargetForNode } from "@/lib/save
 import { exportSavedSqlFileContent } from "@/lib/savedSql/savedSqlExport";
 import { isSqlServerLinkedNode } from "@/lib/database/sqlServerLinkedServers";
 import { flattenTree } from "@/composables/useFlatTree";
-import { createDatabaseCollationOptionsForCharset, DEFAULT_GBASE8S_DATABASE_LOCALE, GBASE8S_DATABASE_LOCALES, nextCreateDatabaseCollation, normalizeCreateDatabaseCharset, parseCreateDatabaseCharsetMetadata } from "@/lib/database/createDatabaseCharsetOptions";
+import { createDatabaseCollationOptionsForCharset, DEFAULT_GBASE8S_DATABASE_LOCALE, defaultGbase8sDatabaseLocale, GBASE8S_DATABASE_LOCALES, nextCreateDatabaseCollation, normalizeCreateDatabaseCharset, parseCreateDatabaseCharsetMetadata } from "@/lib/database/createDatabaseCharsetOptions";
 import { executeWithProductionContextGuard, executeWithProductionSqlGuard } from "@/lib/database/productionExecutionGuard";
 import { connectionIsEffectivelyReadOnly } from "@/lib/database/readOnlyWriteAccess";
 import { buildXuguCompileSql } from "@/lib/database/xuguCompileSql";
@@ -3828,12 +3828,13 @@ function openCreateDatabaseDialog() {
   showCreateDatabaseDialog.value = true;
   if (canSetCreateDatabaseLocale.value) {
     // GBase 8s / Informix: the "charset" control selects the new database's DB_LOCALE, which the
-    // agent applies by opening the CREATE DATABASE session with it. Default to UTF-8 so new
-    // databases can store Chinese; no server charset catalog query is needed.
+    // agent applies by opening the CREATE DATABASE session with it. Seed a UTF-8 default, then
+    // repopulate the options with the collations already present on the connected instance.
     createDatabaseCharsetOptions.value = [...GBASE8S_DATABASE_LOCALES];
     createDatabaseCollationsByCharset.value = {};
     createDatabaseCharset.value = DEFAULT_GBASE8S_DATABASE_LOCALE;
     createDatabaseCollation.value = "";
+    void loadGbase8sDatabaseLocales();
   } else if (canSetCreateDatabaseCharset.value) {
     void loadCreateDatabaseCharsetMetadata();
   }
@@ -3958,6 +3959,33 @@ async function loadCreateDatabaseCharsetMetadata(target: "create" | "edit" = "cr
   }
 }
 
+async function loadGbase8sDatabaseLocales() {
+  const node = activeNode.value;
+  if (!node.connectionId) return;
+  createDatabaseCharsetLoading.value = true;
+  try {
+    await connectionStore.ensureConnected(node.connectionId);
+    const result = await api.executeQuery(node.connectionId, "", "SELECT DISTINCT dbs_collate FROM sysmaster:sysdbslocale ORDER BY 1", undefined, undefined, { maxRows: 500 });
+    if (!showCreateDatabaseDialog.value) return;
+    const idx = result.columns.findIndex((column) => column.trim().toLowerCase() === "dbs_collate");
+    const locales = [...new Set(result.rows.map((row) => String(row[idx >= 0 ? idx : 0] ?? "").trim()).filter(Boolean))];
+    if (!locales.length) throw new Error("no collations");
+    createDatabaseCharsetOptions.value = locales;
+    createDatabaseCollationsByCharset.value = {};
+    if (!locales.includes(createDatabaseCharset.value)) {
+      updateCreateDatabaseCharset(defaultGbase8sDatabaseLocale(locales));
+    }
+  } catch {
+    createDatabaseCharsetOptions.value = [...GBASE8S_DATABASE_LOCALES];
+    createDatabaseCollationsByCharset.value = {};
+    if (!createDatabaseCharsetOptions.value.includes(createDatabaseCharset.value)) {
+      updateCreateDatabaseCharset(DEFAULT_GBASE8S_DATABASE_LOCALE);
+    }
+  } finally {
+    createDatabaseCharsetLoading.value = false;
+  }
+}
+
 function ensureDuckDbFileExtension(path: string): string {
   return /\.(duckdb|db)$/i.test(path) ? path : `${path}.duckdb`;
 }
diff --git a/apps/desktop/src/lib/__tests__/database/createDatabaseLocale.spec.ts b/apps/desktop/src/lib/__tests__/database/createDatabaseLocale.spec.ts
index 4c4c11fa09..6bea85ccbe 100644
--- a/apps/desktop/src/lib/__tests__/database/createDatabaseLocale.spec.ts
+++ b/apps/desktop/src/lib/__tests__/database/createDatabaseLocale.spec.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 import { supportsCreateDatabaseCharset, supportsCreateDatabaseLocale } from "@/lib/database/createDatabaseSql";
-import { DEFAULT_GBASE8S_DATABASE_LOCALE, GBASE8S_DATABASE_LOCALES } from "@/lib/database/createDatabaseCharsetOptions";
+import { DEFAULT_GBASE8S_DATABASE_LOCALE, defaultGbase8sDatabaseLocale, GBASE8S_DATABASE_LOCALES } from "@/lib/database/createDatabaseCharsetOptions";
 
 describe("GBase 8s / Informix create-database locale support", () => {
   it("offers a locale picker only for the gbase8s profile", () => {
@@ -22,4 +22,16 @@ describe("GBase 8s / Informix create-database locale support", () => {
     expect(GBASE8S_DATABASE_LOCALES).toContain("zh_CN.utf8");
     expect(DEFAULT_GBASE8S_DATABASE_LOCALE).toBe("zh_CN.utf8");
   });
+
+  it("seeds the default from instance locales reporting the numeric UTF-8 code set", () => {
+    // Real GBase 8s instances report dbs_collate like zh_CN.57372 (57372 = UTF-8) alongside
+    // en_US.819 (ISO-8859-1); after ORDER BY 1 the plain first entry cannot hold CJK.
+    expect(defaultGbase8sDatabaseLocale(["en_US.819", "zh_CN.57372"])).toBe("zh_CN.57372");
+    expect(defaultGbase8sDatabaseLocale(["en_US.819", "zh_CN.utf8"])).toBe("zh_CN.utf8");
+  });
+
+  it("falls back to the first locale or the static default when no UTF-8 option exists", () => {
+    expect(defaultGbase8sDatabaseLocale(["en_US.819"])).toBe("en_US.819");
+    expect(defaultGbase8sDatabaseLocale([])).toBe(DEFAULT_GBASE8S_DATABASE_LOCALE);
+  });
 });
diff --git a/apps/desktop/src/lib/database/createDatabaseCharsetOptions.ts b/apps/desktop/src/lib/database/createDatabaseCharsetOptions.ts
index eb92dc429c..371492eec6 100644
--- a/apps/desktop/src/lib/database/createDatabaseCharsetOptions.ts
+++ b/apps/desktop/src/lib/database/createDatabaseCharsetOptions.ts
@@ -16,6 +16,12 @@ export const CREATE_DATABASE_CHARSET_OPTIONS = ["utf8mb4", "utf8", "gbk", "latin
 export const GBASE8S_DATABASE_LOCALES = ["zh_CN.utf8", "en_US.utf8", "ja_JP.utf8", "ko_KR.utf8", "zh_CN.gbk", "zh_CN.gb18030", "en_US.819"] as const;
 export const DEFAULT_GBASE8S_DATABASE_LOCALE = "zh_CN.utf8";
 
+// Informix-family instances report dbs_collate with the numeric code set (57372 = UTF-8,
+// 819 = ISO-8859-1) instead of the "utf8" mnemonic, so both spellings must seed the default.
+export function defaultGbase8sDatabaseLocale(locales: string[]): string {
+  return locales.find((locale) => /(?:utf8|57372)/i.test(locale)) ?? locales[0] ?? DEFAULT_GBASE8S_DATABASE_LOCALE;
+}
+
 const FALLBACK_COLLATION_OPTIONS: Record<string, string[]> = {
   ascii: ["ascii_general_ci", "ascii_bin"],
   big5: ["big5_chinese_ci", "big5_bin"],