diff --git a/server/src/bid_doctor/checklist/extract.py b/server/src/bid_doctor/checklist/extract.py
index 697cf7b..89c0e87 100644
--- a/server/src/bid_doctor/checklist/extract.py
+++ b/server/src/bid_doctor/checklist/extract.py
@@ -6,6 +6,7 @@
 
 from __future__ import annotations
 
+import asyncio
 import re
 from dataclasses import dataclass, field
 from typing import Any
@@ -17,6 +18,7 @@ from bid_doctor.document.pipeline.text_layer import Sentence, norm
 
 PROMPT_ID, PROMPT_VERSION = "extract.substantive", 1
 CHUNK_CHARS = 6000
+CONCURRENCY = 4  # 每个解析任务同时调用模型的分块数；TODO(路由表)：按「供应商 × 租户」统一限流
 INVALID = re.compile(r"投标无效|响应无效|无效投标|作无效处理|按无效|否决其投标|否决投标|不予受理")
 RULE_NOTE = re.compile(r"(★|＊|\*|斜体|下划线).{0,30}(实质性|无效|否决)|(实质性).{0,20}(★|＊|\*|斜体|下划线)")
 DECLARED = re.compile(r"★[^。；]{0,12}?共\s*(\d+)\s*[条项处]")
@@ -125,20 +127,28 @@ async def run(ctx: TenantContext, job_id: UUID, sentences: list[Sentence]) -> tu
     note_keys = {n.sentence.key for n in notes}
     declared = {n.marker for n in notes}
     out: list[Extracted] = []
-    for chunk in _chunks(sentences):
-        by_id = {_sid(s): s for s in chunk}
+    chunks = _chunks(sentences)
+    gate = asyncio.Semaphore(CONCURRENCY)
+
+    async def call(chunk: list[Sentence]) -> dict[str, Any]:
         user = (
             "## 标注规则说明\n" + note_text + "\n\n## 待审分块\n" + "\n".join(f"[{_sid(s)}] {s.marked}" for s in chunk)
         )
-        data = await ai.run_json(
-            ctx,
-            job_type="parse_job",
-            job_id=job_id,
-            task="extract.substantive",
-            prompt_id=PROMPT_ID,
-            version=PROMPT_VERSION,
-            user=user,
-        )
+        async with gate:
+            return await ai.run_json(
+                ctx,
+                job_type="parse_job",
+                job_id=job_id,
+                task="extract.substantive",
+                prompt_id=PROMPT_ID,
+                version=PROMPT_VERSION,
+                user=user,
+            )
+
+    # 分块并发调用模型（架构 §3.4）；结果按分块顺序处理，清单顺序和原文一致
+    results = await asyncio.gather(*(call(c) for c in chunks))
+    for chunk, data in zip(chunks, results, strict=True):
+        by_id = {_sid(s): s for s in chunk}
         for it in data.get("items") or []:
             if not isinstance(it, dict):
                 continue
diff --git a/server/src/bid_doctor/core/config.py b/server/src/bid_doctor/core/config.py
index 4f56878..98032c3 100644
--- a/server/src/bid_doctor/core/config.py
+++ b/server/src/bid_doctor/core/config.py
@@ -13,7 +13,7 @@ DEV_SECRET = "dev-insecure-secret-change-me-0000000000000000"  # noqa: S105 - 
 
 
 class Settings(BaseSettings):
-    model_config = SettingsConfigDict(env_prefix="BD_", env_file=".env", extra="ignore")
+    model_config = SettingsConfigDict(env_prefix="BD_", env_file=(".env", "../.env"), extra="ignore")
 
     env: Literal["dev", "test", "prod"] = "dev"