diff --git a/frontend/src/components/ConnectionModal.tsx b/frontend/src/components/ConnectionModal.tsx
index ab65afc..ce4e813 100644
--- a/frontend/src/components/ConnectionModal.tsx
+++ b/frontend/src/components/ConnectionModal.tsx
@@ -1853,7 +1853,7 @@ const ConnectionModal: React.FC<{
       case "mongodb":
         return "retryWrites=true&readPreference=secondaryPreferred";
       case "dameng":
-        return "schema=SYSDBA&escapeProcess=true";
+        return "schema=SYSDBA";
       case "tdengine":
         return "timezone=Asia%2FShanghai";
       default:
diff --git a/internal/db/dameng_impl.go b/internal/db/dameng_impl.go
index d606b1b..ec51b2c 100644
--- a/internal/db/dameng_impl.go
+++ b/internal/db/dameng_impl.go
@@ -31,7 +31,6 @@ func (d *DamengDB) getDSN(config connection.ConnectionConfig) string {
 	// or dm://user:password@host:port
 
 	address := net.JoinHostPort(config.Host, strconv.Itoa(config.Port))
-	escapedPassword := url.PathEscape(config.Password)
 	q := url.Values{}
 	if config.Database != "" {
 		q.Set("schema", config.Database)
@@ -44,15 +43,16 @@ func (d *DamengDB) getDSN(config connection.ConnectionConfig) string {
 			q.Set("SSL_KEY_PATH", keyPath)
 		}
 	}
-	if escapedPassword != config.Password {
-		// 达梦驱动要求：密码包含特殊字符时，password 需 PathEscape，并添加 escapeProcess=true 让驱动解码。
-		q.Set("escapeProcess", "true")
-	}
 	mergeConnectionParamsFromConfig(q, config, "dm", "dameng")
 
-	dsn := fmt.Sprintf("dm://%s:%s@%s", config.User, escapedPassword, address)
+	// 当前达梦 Go 驱动使用字符串切分解析 DSN，认证信息不会做 URL 反解码。
+	// 密码保持原样传入，避免 p%40ss 这类转义文本被当作真实密码登录。
+	dsn := fmt.Sprintf("dm://%s:%s@%s", config.User, config.Password, address)
 	encoded := q.Encode()
 	if encoded == "" {
+		if strings.Contains(config.User, "?") || strings.Contains(config.Password, "?") {
+			return dsn + "?"
+		}
 		return dsn
 	}
 	return dsn + "?" + encoded
diff --git a/internal/db/dsn_test.go b/internal/db/dsn_test.go
index 0deee14..b516196 100644
--- a/internal/db/dsn_test.go
+++ b/internal/db/dsn_test.go
@@ -126,7 +126,7 @@ func TestOracleDSN_EscapesUserAndPassword(t *testing.T) {
 	}
 }
 
-func TestDamengDSN_EscapesPasswordAndEnablesEscapeProcess(t *testing.T) {
+func TestDamengDSN_KeepsRawPasswordForDriverParser(t *testing.T) {
 	d := &DamengDB{}
 	cfg := connection.ConnectionConfig{
 		Type:     "dameng",
@@ -138,20 +138,36 @@ func TestDamengDSN_EscapesPasswordAndEnablesEscapeProcess(t *testing.T) {
 	}
 
 	dsn := d.getDSN(cfg)
-	if strings.Contains(dsn, cfg.Password) {
-		t.Fatalf("dsn 包含原始密码：%s", dsn)
+	if !strings.Contains(dsn, "SYSDBA:p@ss:wo/rd@127.0.0.1:5236") {
+		t.Fatalf("dsn 未保留达梦驱动可识别的原始认证信息：%s", dsn)
 	}
-	if strings.Contains(dsn, "wo/rd") || !strings.Contains(dsn, "wo%2Frd") {
-		t.Fatalf("dsn 未按达梦驱动要求转义密码（至少应转义 '/'）：%s", dsn)
+	if strings.Contains(dsn, "p%40ss") || strings.Contains(dsn, "wo%2Frd") {
+		t.Fatalf("dsn 不应转义达梦密码，驱动不会反解码认证信息：%s", dsn)
 	}
-	if !strings.Contains(dsn, "escapeProcess=true") {
-		t.Fatalf("dsn 缺少 escapeProcess=true：%s", dsn)
+	if strings.Contains(dsn, "escapeProcess=true") {
+		t.Fatalf("dsn 不应自动添加 escapeProcess=true：%s", dsn)
 	}
 	if !strings.Contains(dsn, "schema=DBName") {
 		t.Fatalf("dsn 缺少 schema 参数：%s", dsn)
 	}
 }
 
+func TestDamengDSN_AppendsQuerySentinelForQuestionMarkInPassword(t *testing.T) {
+	d := &DamengDB{}
+	cfg := connection.ConnectionConfig{
+		Type:     "dameng",
+		Host:     "127.0.0.1",
+		Port:     5236,
+		User:     "SYSDBA",
+		Password: "p?ss",
+	}
+
+	dsn := d.getDSN(cfg)
+	if dsn != "dm://SYSDBA:p?ss@127.0.0.1:5236?" {
+		t.Fatalf("dsn = %q, want raw password with trailing query sentinel", dsn)
+	}
+}
+
 func TestDamengDSN_AppendsSSLCertAndKeyParams(t *testing.T) {
 	d := &DamengDB{}
 	cfg := connection.ConnectionConfig{