diff --git a/frontend/js/trial-periods-page.js b/frontend/js/trial-periods-page.js
index 5e7e7a8..1845d7b 100644
--- a/frontend/js/trial-periods-page.js
+++ b/frontend/js/trial-periods-page.js
@@ -72,8 +72,11 @@ async function loadCustomersForDropdown() {
         console.log('Customers data:', data);
 
         const customers = data.customers || [];
-        console.log('Number of customers:', customers.length);
-        customersMap = {};
+        // Use the complete customer map for ID->Name lookups
+        customersMap = data.customerMap || {};
+
+        console.log('Number of unique customers:', customers.length);
+        console.log('Number of customer ID mappings:', Object.keys(customersMap).length);
 
         const select = document.getElementById('trialCustomerSelect');
         if (!select) {
@@ -84,15 +87,15 @@ async function loadCustomersForDropdown() {
         // Keep the first option (请选择客户)
         select.innerHTML = '<option value="">请选择客户</option>';
 
+        // Use the deduplicated list for dropdown options
         customers.forEach(customer => {
-            customersMap[customer.id] = customer.customerName;
             const option = document.createElement('option');
             option.value = customer.id;
             option.textContent = customer.customerName;
             select.appendChild(option);
         });
 
-        console.log('Customers loaded successfully. Total:', customers.length);
+        console.log('Customers loaded successfully. Dropdown options:', customers.length);
     } catch (error) {
         console.error('Error loading customers:', error);
     }