diff --git a/src-tauri/src/commands.rs b/src-tauri/src/commands.rs
index d924d35..f3a77cc 100644
--- a/src-tauri/src/commands.rs
+++ b/src-tauri/src/commands.rs
@@ -10,6 +10,23 @@ use crate::config::{ConfigStatus, get_claude_settings_path};
 use crate::provider::Provider;
 use crate::store::AppState;
 
+fn norm_name(s: &str) -> String { s.trim().to_lowercase() }
+
+fn extract_key_for(app_type: &crate::app_config::AppType, settings: &serde_json::Value) -> Option<String> {
+    match app_type {
+        crate::app_config::AppType::Claude => settings
+            .get("env")
+            .and_then(|env| env.get("ANTHROPIC_AUTH_TOKEN"))
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string()),
+        crate::app_config::AppType::Codex => settings
+            .get("auth")
+            .and_then(|auth| auth.get("OPENAI_API_KEY").or_else(|| auth.get("openai_api_key")))
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string()),
+    }
+}
+
 /// 获取所有供应商
 #[tauri::command]
 pub async fn get_providers(
@@ -83,6 +100,17 @@ pub async fn add_provider(
         .get_manager_mut(&app_type)
         .ok_or_else(|| format!("应用类型不存在: {:?}", app_type))?;
 
+    // 名称(忽略大小写)+Key 唯一性校验
+    let new_key = extract_key_for(&app_type, &provider.settings_config).unwrap_or_default();
+    let new_name = norm_name(&provider.name);
+    if manager.providers.iter().any(|(id, p)| {
+        *id != provider.id
+            && norm_name(&p.name) == new_name
+            && extract_key_for(&app_type, &p.settings_config).unwrap_or_default() == new_key
+    }) {
+        return Err("已存在同名(不区分大小写)且相同密钥的供应商".to_string());
+    }
+
     // 根据应用类型保存配置文件
     // 不再写入供应商副本文件，仅更新内存配置（SSOT）
     let is_current = manager.current == provider.id;
@@ -175,6 +203,17 @@ pub async fn update_provider(
         return Err(format!("供应商不存在: {}", provider.id));
     }
 
+    // 名称(忽略大小写)+Key 唯一性校验（允许覆盖自身）
+    let new_key = extract_key_for(&app_type, &provider.settings_config).unwrap_or_default();
+    let new_name = norm_name(&provider.name);
+    if manager.providers.iter().any(|(id, p)| {
+        *id != provider.id
+            && norm_name(&p.name) == new_name
+            && extract_key_for(&app_type, &p.settings_config).unwrap_or_default() == new_key
+    }) {
+        return Err("已存在同名(不区分大小写)且相同密钥的供应商".to_string());
+    }
+
     // 不再写入供应商副本文件，仅更新内存配置（SSOT）
 
     let is_current = manager.current == provider.id;
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 077b029..5a6f299 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -66,6 +66,11 @@ pub fn run() {
                 // 确保两个 App 条目存在
                 config_guard.ensure_app(&app_config::AppType::Claude);
                 config_guard.ensure_app(&app_config::AppType::Codex);
+                // 启动去重：名称(忽略大小写)+API Key
+                let removed = migration::dedupe_config(&mut *config_guard);
+                if removed > 0 {
+                    log::info!("已去重重复供应商 {} 个", removed);
+                }
             }
 
             // 保存配置
diff --git a/src-tauri/src/migration.rs b/src-tauri/src/migration.rs
index 7b28237..809c0ca 100644
--- a/src-tauri/src/migration.rs
+++ b/src-tauri/src/migration.rs
@@ -52,6 +52,10 @@ fn extract_codex_api_key(value: &Value) -> Option<String> {
         .map(|s| s.to_string())
 }
 
+fn norm_name(s: &str) -> String {
+    s.trim().to_lowercase()
+}
+
 // 去重策略：name + 原始 key 直接比较（不做哈希）
 
 fn scan_claude_copies() -> Vec<(String, PathBuf, Value)> {
@@ -184,7 +188,11 @@ pub fn migrate_copies_into_config(config: &mut MultiAppConfig) -> Result<bool, S
             .iter()
             .find_map(|(id, p)| {
                 let pk = extract_claude_api_key(&p.settings_config);
-                if p.name == *name && pk == cand_key { Some(id.clone()) } else { None }
+                if norm_name(&p.name) == norm_name(name) && pk == cand_key {
+                    Some(id.clone())
+                } else {
+                    None
+                }
             });
         if let Some(exist_id) = exist_id {
             if let Some(prov) = manager.providers.get_mut(&exist_id) {
@@ -212,7 +220,11 @@ pub fn migrate_copies_into_config(config: &mut MultiAppConfig) -> Result<bool, S
             .iter()
             .find_map(|(id, p)| {
                 let pk = extract_claude_api_key(&p.settings_config);
-                if p.name == *name && pk == cand_key { Some(id.clone()) } else { None }
+                if norm_name(&p.name) == norm_name(name) && pk == cand_key {
+                    Some(id.clone())
+                } else {
+                    None
+                }
             });
         if let Some(exist_id) = exist_id {
             if let Some(prov) = manager.providers.get_mut(&exist_id) {
@@ -282,7 +294,11 @@ pub fn migrate_copies_into_config(config: &mut MultiAppConfig) -> Result<bool, S
             .iter()
             .find_map(|(id, p)| {
                 let pk = extract_codex_api_key(&p.settings_config);
-                if p.name == *name && pk == cand_key { Some(id.clone()) } else { None }
+                if norm_name(&p.name) == norm_name(name) && pk == cand_key {
+                    Some(id.clone())
+                } else {
+                    None
+                }
             });
         if let Some(exist_id) = exist_id {
             if let Some(prov) = manager.providers.get_mut(&exist_id) {
@@ -310,7 +326,11 @@ pub fn migrate_copies_into_config(config: &mut MultiAppConfig) -> Result<bool, S
             .iter()
             .find_map(|(id, p)| {
                 let pk = extract_codex_api_key(&p.settings_config);
-                if p.name == *name && pk == cand_key { Some(id.clone()) } else { None }
+                if norm_name(&p.name) == norm_name(name) && pk == cand_key {
+                    Some(id.clone())
+                } else {
+                    None
+                }
             });
         if let Some(exist_id) = exist_id {
             if let Some(prov) = manager.providers.get_mut(&exist_id) {
@@ -365,3 +385,44 @@ pub fn migrate_copies_into_config(config: &mut MultiAppConfig) -> Result<bool, S
     fs::write(&marker, b"done").map_err(|e| format!("写入迁移标记失败: {}", e))?;
     Ok(true)
 }
+
+/// 启动时对现有配置做一次去重：按名称(忽略大小写)+API Key
+pub fn dedupe_config(config: &mut MultiAppConfig) -> usize {
+    use std::collections::HashMap as Map;
+
+    fn dedupe_one(
+        mgr: &mut crate::provider::ProviderManager,
+        extract_key: &dyn Fn(&Value) -> Option<String>,
+    ) -> usize {
+        let mut keep: Map<String, String> = Map::new(); // key -> id 保留
+        let mut remove: Vec<String> = Vec::new();
+        for (id, p) in mgr.providers.iter() {
+            let k = format!("{}|{}", norm_name(&p.name), extract_key(&p.settings_config).unwrap_or_default());
+            if let Some(exist_id) = keep.get(&k) {
+                // 若当前是正在使用的，则用当前替换之前的，反之丢弃当前
+                if *id == mgr.current {
+                    // 替换：把原先的标记为删除，改保留为当前
+                    remove.push(exist_id.clone());
+                    keep.insert(k, id.clone());
+                } else {
+                    remove.push(id.clone());
+                }
+            } else {
+                keep.insert(k, id.clone());
+            }
+        }
+        for id in remove.iter() {
+            mgr.providers.remove(id);
+        }
+        remove.len()
+    }
+
+    let mut removed = 0;
+    if let Some(mgr) = config.get_manager_mut(&crate::app_config::AppType::Claude) {
+        removed += dedupe_one(mgr, &extract_claude_api_key);
+    }
+    if let Some(mgr) = config.get_manager_mut(&crate::app_config::AppType::Codex) {
+        removed += dedupe_one(mgr, &extract_codex_api_key);
+    }
+    removed
+}