diff --git a/apps/ai-game-creator-shell/src-tauri/src/commands.rs b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
index 50352f6d4..9335db148 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/commands.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
@@ -1,5 +1,7 @@
 use super::*;
 use crate::ui_editor::resource::font::FontAsset;
+use sha2::{Digest, Sha256};
+use std::collections::HashSet;
 
 const UI_EDITOR_FONT_MAX_FILE_SIZE: u64 = 8 * 1024 * 1024;
 const UI_EDITOR_FONT_MAX_TOTAL_SIZE: u64 = 32 * 1024 * 1024;
@@ -2320,6 +2322,54 @@ mod ui_editor_font_tests {
     }
 }
 
+#[cfg(test)]
+mod remote_asset_path_tests {
+    use super::*;
+
+    #[test]
+    fn remote_asset_paths_distinguish_ids_that_sanitize_to_the_same_name() {
+        let slash_path = remote_asset_local_path("a/b", "png");
+        let colon_path = remote_asset_local_path("a:b", "png");
+
+        assert_ne!(slash_path, colon_path);
+        assert_eq!(slash_path, remote_asset_local_path("a/b", "png"));
+        assert!(slash_path.starts_with("assets/uploads/remote-a_b-"));
+        assert!(slash_path.ends_with(".png"));
+    }
+
+    #[test]
+    fn duplicate_remote_asset_destination_is_rejected() {
+        let mut destinations = HashSet::new();
+        let local_path = remote_asset_local_path("stable-id", "webp");
+
+        reserve_remote_asset_destination(&mut destinations, &local_path)
+            .expect("reserve first destination");
+        assert_eq!(
+            reserve_remote_asset_destination(&mut destinations, &local_path)
+                .expect_err("reject duplicate destination"),
+            format!("平台素材目标路径重复：{local_path}")
+        );
+    }
+}
+
+fn remote_asset_local_path(asset_id: &str, extension: &str) -> String {
+    let readable_id = sanitize_file_name(asset_id);
+    let identity_digest = format!("{:x}", Sha256::digest(asset_id.as_bytes()));
+    let short_digest = &identity_digest[..12];
+    format!("assets/uploads/remote-{readable_id}-{short_digest}.{extension}")
+}
+
+fn reserve_remote_asset_destination(
+    destinations: &mut HashSet<String>,
+    local_path: &str,
+) -> Result<(), String> {
+    if destinations.insert(local_path.to_string()) {
+        Ok(())
+    } else {
+        Err(format!("平台素材目标路径重复：{local_path}"))
+    }
+}
+
 pub(crate) async fn import_ui_editor_remote_assets(
     project_path: String,
     assets: Vec<serde_json::Value>,
@@ -2332,6 +2382,7 @@ pub(crate) async fn import_ui_editor_remote_assets(
     // IPC 只传稳定引用/签名 URL，由 Rust 流式下载并限制响应体；下载期间不占有项目写锁。
     let mut total_size = 0u64;
     let mut downloads = Vec::with_capacity(assets.len());
+    let mut destinations = HashSet::with_capacity(assets.len());
     for asset in assets {
         let asset_id = json_string_field(&asset, "assetId")
             .or_else(|| json_string_field(&asset, "objectKey"))
@@ -2358,21 +2409,21 @@ pub(crate) async fn import_ui_editor_remote_assets(
         } else {
             return Err("平台素材不是受支持的 PNG/JPEG/WEBP 图片".to_string());
         };
-        downloads.push((asset, asset_id, media_type.to_string(), bytes));
+        let extension = infer_file_extension(
+            json_string_field(&asset, "objectKey")
+                .or_else(|| json_string_field(&asset, "imageSrc"))
+                .as_deref(),
+            media_type,
+        );
+        let local_path = remote_asset_local_path(&asset_id, extension);
+        reserve_remote_asset_destination(&mut destinations, &local_path)?;
+        downloads.push((asset, asset_id, media_type.to_string(), local_path, bytes));
     }
 
     let _lock = acquire_project_write_lock(root, "canvas.asset_import")?;
     // 远程素材导入保持与本地图片/字体相同的增量语义，不对已成功项目文件做整批回滚。
     let mut imported = Vec::with_capacity(downloads.len());
-    for (asset, asset_id, media_type, bytes) in downloads {
-        let extension = infer_file_extension(
-            json_string_field(&asset, "objectKey")
-                .or_else(|| json_string_field(&asset, "imageSrc"))
-                .as_deref(),
-            &media_type,
-        );
-        let local_name = sanitize_file_name(&asset_id);
-        let local_path = format!("assets/uploads/remote-{local_name}.{extension}");
+    for (asset, asset_id, media_type, local_path, bytes) in downloads {
         let target = resolve_local_project_path(root, &local_path)?;
         if let Some(parent) = target.parent() {
             fs::create_dir_all(parent).map_err(|e| format!("创建导入目录失败：{e}"))?;
diff --git a/docs/technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md b/docs/technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md
index 6f0f35a4e..6bc8c47ad 100644
--- a/docs/technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md
+++ b/docs/technical/【技术方案】AI游戏创作智能体App实施计划-2026-06-24.md
@@ -46,7 +46,7 @@ UI Editor 当前把“识别界面结构”定义为结构草稿阶段，而不
 
 `merge_ui` 的 Tauri 命令参数继续保持 `State`，不新增前端字符串 payload 或 IPC 参数上限。命令进入 Rust 后、构建 LLM 请求前，按每棵源树独立限制 `512` 个节点和 `32` 层，不跨树求和；序列化投影超过 `2 MiB` 时同样拒绝。本边界不宣称覆盖 Tauri 自身的入参反序列化阶段。
 
-UI Editor 的图片、字体和远程素材导入采用增量提交合同：输入先完成各入口已有的预检，随后按顺序逐项写入和登记；前面已成功的项目在后续写入或登记失败时保持有效，调用方必须重新读取 manifest 取得已提交集合。该入口不提供整批事务回滚，也不承诺失败后“零文件、零 manifest 变化”；后续如需原子批量导入，必须新增明确的 transaction / reconciliation 合同，不能把当前入口静默改成另一种语义。
+UI Editor 的图片、字体和远程素材导入采用增量提交合同：输入先完成各入口已有的预检，随后按顺序逐项写入和登记；前面已成功的项目在后续写入或登记失败时保持有效，调用方必须重新读取 manifest 取得已提交集合。远程素材目标文件名必须同时包含清洗后的可读 ID 与原始稳定 ID 的确定性摘要，不能让不同 ID 因清洗结果相同而覆盖已有文件；同一批次计算出的重复目标路径必须在写入前拒绝。该入口不提供整批事务回滚，也不承诺失败后“零文件、零 manifest 变化”；后续如需原子批量导入，必须新增明确的 transaction / reconciliation 合同，不能把当前入口静默改成另一种语义。
 
 作为 LLM 参考图使用的 UI 设计图单张文件上限为 `5 MiB`，不设置多图合计大小上限。前端设计图 AssetImporter 对本地和远端入口使用相同单文件限制；结构识别与界面语义建议在 Rust 中先检查文件元数据、再有限读取，并把读取与 base64 编码放在 blocking worker，避免阻塞 Tokio async worker。本阶段不新增图片像素数限制或命令超时。