diff --git a/.env.example b/.env.example
index 69b3eee..7afd54c 100644
--- a/.env.example
+++ b/.env.example
@@ -9,12 +9,31 @@ ROBOFLOW_API_FALLBACK_URLS=
 # 2) Create a Read token and set it below
 HF_TOKEN=
 
+# Optional OpenRouter defaults
+# OPENROUTER_API_KEY=sk-or-v1-xxx
+# OPENROUTER_BASE_URL=https://openrouter.ai/api/v1
+# OPENROUTER_IMAGE_MODEL=google/gemini-3-pro-image-preview
+# OPENROUTER_SVG_MODEL=google/gemini-3.1-pro-preview
+
+# Optional Bianxie defaults
+# BIANXIE_API_KEY=your_bianxie_key
+# BIANXIE_BASE_URL=https://api.bianxie.ai/v1
+# BIANXIE_IMAGE_MODEL=gemini-3-pro-image-preview
+# BIANXIE_SVG_MODEL=gemini-3.1-pro-preview
+
+# Optional Gemini defaults
+# GEMINI_API_KEY=your_gemini_key
+# GEMINI_BASE_URL=https://generativelanguage.googleapis.com/v1beta
+# GEMINI_IMAGE_MODEL=gemini-3-pro-image-preview
+# GEMINI_SVG_MODEL=gemini-3.1-pro
+
 # Optional: OpenRouter multimodal retry tuning (step 4 SVG generation)
 # OPENROUTER_MULTIMODAL_RETRIES=3
 # OPENROUTER_MULTIMODAL_RETRY_DELAY=1.5
 
 # Optional build source overrides (for restricted networks)
-# BASE_IMAGE=docker.m.daocloud.io/library/python:3.11-slim
+# BASE_IMAGE=python:3.11-slim-bookworm
+# DOCKER_PLATFORM=linux/amd64
 # PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
 # PIP_EXTRA_INDEX_URL=
 
diff --git a/README.md b/README.md
index 9fc8598..7933ded 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,22 @@ HF_TOKEN=hf_xxx
 Optional but recommended:
 
 ```bash
+# LLM provider defaults (used when CLI flags are omitted)
+OPENROUTER_API_KEY=sk-or-v1-xxx
+OPENROUTER_BASE_URL=https://openrouter.ai/api/v1
+OPENROUTER_IMAGE_MODEL=google/gemini-3-pro-image-preview
+OPENROUTER_SVG_MODEL=google/gemini-3.1-pro-preview
+
+BIANXIE_API_KEY=your_bianxie_key
+BIANXIE_BASE_URL=https://api.bianxie.ai/v1
+BIANXIE_IMAGE_MODEL=gemini-3-pro-image-preview
+BIANXIE_SVG_MODEL=gemini-3.1-pro-preview
+
+GEMINI_API_KEY=your_gemini_key
+GEMINI_BASE_URL=https://generativelanguage.googleapis.com/v1beta
+GEMINI_IMAGE_MODEL=gemini-3-pro-image-preview
+GEMINI_SVG_MODEL=gemini-3.1-pro
+
 # SAM3 API backend (Docker default in UI is Roboflow)
 ROBOFLOW_API_KEY=your_roboflow_key
 
@@ -323,6 +339,8 @@ Optional CLI flags (API):
 | **Bianxie** | `api.bianxie.ai/v1` | OpenAI-compatible API |
 | **Gemini (Google)** | `generativelanguage.googleapis.com/v1beta` | Official Google Gemini API (`google-genai`) |
 
+Each provider can read `API_KEY`, `BASE_URL`, `IMAGE_MODEL`, and `SVG_MODEL` defaults from `.env`.
+
 Common CLI flags:
 
 - `--provider` (openrouter | bianxie | gemini)
diff --git a/README_ZH.md b/README_ZH.md
index e133bca..1b3bcae 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -135,6 +135,22 @@ HF_TOKEN=hf_xxx
 可选但建议配置：
 
 ```bash
+# LLM provider 默认值（当未传 CLI 参数时使用）
+OPENROUTER_API_KEY=sk-or-v1-xxx
+OPENROUTER_BASE_URL=https://openrouter.ai/api/v1
+OPENROUTER_IMAGE_MODEL=google/gemini-3-pro-image-preview
+OPENROUTER_SVG_MODEL=google/gemini-3.1-pro-preview
+
+BIANXIE_API_KEY=your_bianxie_key
+BIANXIE_BASE_URL=https://api.bianxie.ai/v1
+BIANXIE_IMAGE_MODEL=gemini-3-pro-image-preview
+BIANXIE_SVG_MODEL=gemini-3.1-pro-preview
+
+GEMINI_API_KEY=your_gemini_key
+GEMINI_BASE_URL=https://generativelanguage.googleapis.com/v1beta
+GEMINI_IMAGE_MODEL=gemini-3-pro-image-preview
+GEMINI_SVG_MODEL=gemini-3.1-pro
+
 # SAM3 API（Docker/Web 默认后端为 Roboflow）
 ROBOFLOW_API_KEY=your_roboflow_key
 
@@ -313,6 +329,8 @@ python autofigure2.py \
 | **Bianxie** | `api.bianxie.ai/v1` | 兼容 OpenAI 接口 |
 | **Gemini (Google)** | `generativelanguage.googleapis.com/v1beta` | Google 官方 Gemini API（`google-genai`） |
 
+每个 provider 都支持从 `.env` 读取 `API_KEY`、`BASE_URL`、`IMAGE_MODEL`、`SVG_MODEL` 默认值。
+
 常用 CLI 参数：
 
 - `--provider` (openrouter | bianxie | gemini)
diff --git a/autofigure2.py b/autofigure2.py
index 95556f0..042877c 100644
--- a/autofigure2.py
+++ b/autofigure2.py
@@ -90,19 +90,36 @@
 
 PROVIDER_CONFIGS = {
     "openrouter": {
-        "base_url": "https://openrouter.ai/api/v1",
-        "default_image_model": "google/gemini-3-pro-image-preview",
-        "default_svg_model": "google/gemini-3.1-pro-preview",
+        "api_key": os.environ.get("OPENROUTER_API_KEY", ""),
+        "base_url": os.environ.get("OPENROUTER_BASE_URL", "https://openrouter.ai/api/v1"),
+        "default_image_model": os.environ.get(
+            "OPENROUTER_IMAGE_MODEL", "google/gemini-3-pro-image-preview"
+        ),
+        "default_svg_model": os.environ.get(
+            "OPENROUTER_SVG_MODEL", "google/gemini-3.1-pro-preview"
+        ),
     },
     "bianxie": {
-        "base_url": "https://api.bianxie.ai/v1",
-        "default_image_model": "gemini-3-pro-image-preview",
-        "default_svg_model": "gemini-3.1-pro-preview",
+        "api_key": os.environ.get("BIANXIE_API_KEY", ""),
+        "base_url": os.environ.get("BIANXIE_BASE_URL", "https://api.bianxie.ai/v1"),
+        "default_image_model": os.environ.get(
+            "BIANXIE_IMAGE_MODEL", "gemini-3-pro-image-preview"
+        ),
+        "default_svg_model": os.environ.get(
+            "BIANXIE_SVG_MODEL", "gemini-3.1-pro-preview"
+        ),
     },
     "gemini": {
-        "base_url": "https://generativelanguage.googleapis.com/v1beta",
-        "default_image_model": "gemini-3-pro-image-preview",
-        "default_svg_model": "gemini-3.1-pro",
+        "api_key": os.environ.get("GEMINI_API_KEY", ""),
+        "base_url": os.environ.get(
+            "GEMINI_BASE_URL", "https://generativelanguage.googleapis.com/v1beta"
+        ),
+        "default_image_model": os.environ.get(
+            "GEMINI_IMAGE_MODEL", "gemini-3-pro-image-preview"
+        ),
+        "default_svg_model": os.environ.get(
+            "GEMINI_SVG_MODEL", "gemini-3.1-pro"
+        ),
     },
 }
 
@@ -2817,11 +2834,12 @@ def method_to_svg(
     Returns:
         结果字典
     """
-    if not api_key:
-        raise ValueError("必须提供 api_key")
-
     # 获取默认配置
     config = PROVIDER_CONFIGS[provider]
+    if not api_key:
+        api_key = config.get("api_key") or None
+    if not api_key:
+        raise ValueError("必须提供 api_key")
     if base_url is None:
         base_url = config["base_url"]
     if image_gen_model is None:
diff --git a/docker-compose.yml b/docker-compose.yml
index 180ccc1..f84f159 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,18 @@ services:
       HF_HOME: /app/.cache/huggingface
       HF_TOKEN: ${HF_TOKEN:-}
       HUGGINGFACE_HUB_TOKEN: ${HF_TOKEN:-}
+      OPENROUTER_API_KEY: ${OPENROUTER_API_KEY:-}
+      OPENROUTER_BASE_URL: ${OPENROUTER_BASE_URL:-}
+      OPENROUTER_IMAGE_MODEL: ${OPENROUTER_IMAGE_MODEL:-}
+      OPENROUTER_SVG_MODEL: ${OPENROUTER_SVG_MODEL:-}
+      BIANXIE_API_KEY: ${BIANXIE_API_KEY:-}
+      BIANXIE_BASE_URL: ${BIANXIE_BASE_URL:-}
+      BIANXIE_IMAGE_MODEL: ${BIANXIE_IMAGE_MODEL:-}
+      BIANXIE_SVG_MODEL: ${BIANXIE_SVG_MODEL:-}
+      GEMINI_API_KEY: ${GEMINI_API_KEY:-}
+      GEMINI_BASE_URL: ${GEMINI_BASE_URL:-}
+      GEMINI_IMAGE_MODEL: ${GEMINI_IMAGE_MODEL:-}
+      GEMINI_SVG_MODEL: ${GEMINI_SVG_MODEL:-}
       OPENROUTER_MULTIMODAL_RETRIES: ${OPENROUTER_MULTIMODAL_RETRIES:-3}
       OPENROUTER_MULTIMODAL_RETRY_DELAY: ${OPENROUTER_MULTIMODAL_RETRY_DELAY:-1.5}
       ROBOFLOW_API_KEY: ${ROBOFLOW_API_KEY:-}