diff --git a/settings.php b/settings.php
index de7c242..2654b11 100644
--- a/settings.php
+++ b/settings.php
@@ -2454,10 +2454,14 @@ function themeoptions_page(){
 							if (response.success) {
 								alert('✓ ' + response.data.message);
 							} else {
-								alert('✗ <?php _e('测试失败:', 'argon'); ?> ' + response.data.message);
+								// wp_send_json_error 的错误消息在 response.data 中
+								let errorMsg = response.data || '<?php _e('未知错误', 'argon'); ?>';
+								alert('✗ <?php _e('测试失败:', 'argon'); ?> ' + errorMsg);
 							}
 							$btn.prop('disabled', false).html(originalHtml);
-						}).fail(function() {
+						}).fail(function(xhr, status, error) {
+							// AJAX 请求本身失败
+							console.error('AJAX Error:', status, error);
 							alert('<?php _e('请求失败，请重试', 'argon'); ?>');
 							$btn.prop('disabled', false).html(originalHtml);
 						});
diff --git a/test-api-test-function.php b/test-api-test-function.php
new file mode 100644
index 0000000..de60996
--- /dev/null
+++ b/test-api-test-function.php
@@ -0,0 +1,164 @@
+<?php
+/**
+ * 测试 API 测试功能
+ * 访问: http://your-site.com/wp-content/themes/argon/test-api-test-function.php
+ */
+
+require_once('../../../wp-load.php');
+
+if (!current_user_can('manage_options')) {
+	wp_die('权限不足');
+}
+
+echo '<h1>API 测试功能诊断</h1>';
+
+// 1. 检查函数是否存在
+echo '<h2>1. 函数存在性检查</h2>';
+$functions = [
+	'argon_ajax_test_unified_api',
+	'argon_get_api_by_id',
+	'argon_get_all_apis'
+];
+
+foreach ($functions as $func) {
+	if (function_exists($func)) {
+		echo '<p style="color: green;">✓ ' . $func . ' 存在</p>';
+	} else {
+		echo '<p style="color: red;">✗ ' . $func . ' 不存在</p>';
+	}
+}
+
+// 2. 检查是否有 API 配置
+echo '<h2>2. API 配置检查</h2>';
+$all_apis = argon_get_all_apis();
+if (empty($all_apis)) {
+	echo '<p style="color: orange;">⚠ 没有配置任何 API</p>';
+} else {
+	echo '<p style="color: green;">✓ 已配置 ' . count($all_apis) . ' 个 API</p>';
+	foreach ($all_apis as $api) {
+		echo '<div style="margin: 10px 0; padding: 10px; background: #f5f5f5; border-left: 4px solid #5e72e4;">';
+		echo '<strong>' . esc_html($api['name']) . '</strong><br>';
+		echo 'ID: ' . esc_html($api['id']) . '<br>';
+		echo '提供商: ' . esc_html($api['provider']) . '<br>';
+		echo '模型: ' . esc_html($api['model']) . '<br>';
+		echo '</div>';
+	}
+}
+
+// 3. 检查 AJAX action 是否注册
+echo '<h2>3. AJAX Action 注册检查</h2>';
+global $wp_filter;
+if (isset($wp_filter['wp_ajax_argon_ajax_test_unified_api'])) {
+	echo '<p style="color: green;">✓ wp_ajax_argon_ajax_test_unified_api 已注册</p>';
+} else {
+	echo '<p style="color: red;">✗ wp_ajax_argon_ajax_test_unified_api 未注册</p>';
+}
+
+// 4. 测试 nonce 生成
+echo '<h2>4. Nonce 生成测试</h2>';
+$nonce = wp_create_nonce('argon_test_unified_api');
+echo '<p>生成的 nonce: <code>' . $nonce . '</code></p>';
+echo '<p>验证结果: ';
+if (wp_verify_nonce($nonce, 'argon_test_unified_api')) {
+	echo '<span style="color: green;">✓ 验证通过</span></p>';
+} else {
+	echo '<span style="color: red;">✗ 验证失败</span></p>';
+}
+
+// 5. 模拟 AJAX 请求测试
+if (!empty($all_apis)) {
+	echo '<h2>5. 模拟 AJAX 请求测试</h2>';
+	$test_api = $all_apis[0];
+	echo '<p>测试 API: ' . esc_html($test_api['name']) . '</p>';
+	
+	// 模拟 $_POST 数据
+	$_POST['api_id'] = $test_api['id'];
+	$_POST['nonce'] = wp_create_nonce('argon_test_unified_api');
+	
+	echo '<p>开始测试...</p>';
+	
+	// 获取 API 配置
+	$api = argon_get_api_by_id($test_api['id']);
+	if (!$api) {
+		echo '<p style="color: red;">✗ 无法获取 API 配置</p>';
+	} else {
+		echo '<p style="color: green;">✓ 成功获取 API 配置</p>';
+		
+		// 获取默认端点
+		$default_endpoints = [
+			'openai' => 'https://api.openai.com/v1/chat/completions',
+			'anthropic' => 'https://api.anthropic.com/v1/messages',
+			'deepseek' => 'https://api.deepseek.com/v1/chat/completions',
+			'xiaomi' => 'https://api.mimo.xiaomi.com/v1/chat/completions',
+			'qianwen' => 'https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions',
+			'wenxin' => 'https://aip.baidubce.com/rpc/2.0/ai_custom/v1/wenxinworkshop/chat/completions',
+			'doubao' => 'https://ark.cn-beijing.volces.com/api/v3/chat/completions',
+			'kimi' => 'https://api.moonshot.cn/v1/chat/completions',
+			'zhipu' => 'https://open.bigmodel.cn/api/paas/v4/chat/completions',
+			'siliconflow' => 'https://api.siliconflow.cn/v1/chat/completions'
+		];
+		
+		$api_endpoint = !empty($api['api_endpoint']) ? $api['api_endpoint'] : $default_endpoints[$api['provider']];
+		$model = !empty($api['model']) ? $api['model'] : 'gpt-4o-mini';
+		
+		echo '<p>API 端点: <code>' . esc_html($api_endpoint) . '</code></p>';
+		echo '<p>模型: <code>' . esc_html($model) . '</code></p>';
+		
+		// 构建测试请求
+		$data = [
+			'model' => $model,
+			'messages' => [
+				[
+					'role' => 'user',
+					'content' => '你好，这是一个测试。请回复"测试成功"。'
+				]
+			],
+			'max_tokens' => 50
+		];
+		
+		echo '<p>发送测试请求...</p>';
+		$start_time = microtime(true);
+		
+		$response = wp_remote_post($api_endpoint, [
+			'headers' => [
+				'Content-Type' => 'application/json',
+				'Authorization' => 'Bearer ' . $api['api_key']
+			],
+			'body' => json_encode($data),
+			'timeout' => 30
+		]);
+		
+		$response_time = round((microtime(true) - $start_time) * 1000);
+		
+		if (is_wp_error($response)) {
+			echo '<p style="color: red;">✗ 请求失败: ' . $response->get_error_message() . '</p>';
+		} else {
+			$status_code = wp_remote_retrieve_response_code($response);
+			$body = wp_remote_retrieve_body($response);
+			
+			echo '<p>HTTP 状态码: <code>' . $status_code . '</code></p>';
+			echo '<p>响应时间: <code>' . $response_time . 'ms</code></p>';
+			
+			if ($status_code === 200) {
+				$result = json_decode($body, true);
+				if (isset($result['choices'][0]['message']['content']) || isset($result['content'])) {
+					echo '<p style="color: green;">✓ API 测试成功！</p>';
+					if (isset($result['choices'][0]['message']['content'])) {
+						echo '<p>AI 回复: ' . esc_html($result['choices'][0]['message']['content']) . '</p>';
+					}
+				} else {
+					echo '<p style="color: red;">✗ API 返回格式异常</p>';
+					echo '<pre>' . htmlspecialchars($body) . '</pre>';
+				}
+			} else {
+				echo '<p style="color: red;">✗ API 返回错误</p>';
+				echo '<pre>' . htmlspecialchars($body) . '</pre>';
+			}
+		}
+	}
+}
+
+echo '<hr>';
+echo '<h2>测试完成</h2>';
+echo '<p><a href="' . admin_url('themes.php?page=argon-theme-options') . '">返回设置页</a></p>';
+?>