diff --git a/geo_tools/__init__.py b/geo_tools/__init__.py
index cd0631c..d0739a4 100644
--- a/geo_tools/__init__.py
+++ b/geo_tools/__init__.py
@@ -30,149 +30,11 @@ except PackageNotFoundError:
 # ── 配置 & 日志 ───────────────────────────────────────────────────────────────
 from geo_tools.config.settings import settings
 from geo_tools.utils.logger import get_logger, set_global_level
-from geo_tools.utils.validators import (
-    SUPPORTED_VECTOR_EXTENSIONS,
-    is_supported_vector_format,
-    is_valid_crs,
-    validate_crs,
-    validate_geometry,
-    validate_vector_path,
-)
-
-# ── IO ────────────────────────────────────────────────────────────────────────
-from geo_tools.io.readers import (
-    list_gdb_layers,
-    list_gpkg_layers,
-    read_csv_points,
-    read_gdb,
-    read_gpkg,
-    read_vector,
-)
-from geo_tools.io.writers import (
-    write_csv,
-    write_gdb,
-    write_gpkg,
-    write_vector,
-)
-
-# ── 核心处理 ──────────────────────────────────────────────────────────────────
-from geo_tools.core.geometry import (
-    buffer_geometry,
-    bounding_box,
-    centroid,
-    contains,
-    convex_hull,
-    difference,
-    distance_between,
-    fix_geometry,
-    intersect,
-    intersects,
-    is_valid_geometry,
-    symmetric_difference,
-    unary_union,
-    union,
-    within,
-)
-from geo_tools.core.projection import (
-    CGCS2000,
-    CGCS2000_UTM_50N,
-    WEB_MERCATOR,
-    WGS84,
-    crs_to_epsg,
-    get_crs_info,
-    suggest_projected_crs,
-    transform_coordinates,
-    transform_point,
-)
-from geo_tools.core.vector import (
-    add_area_column,
-    clip_to_extent,
-    dissolve_by,
-    drop_invalid_geometries,
-    explode_multipart,
-    reproject,
-    set_crs,
-    spatial_join,
-)
-
-# ── 空间分析 ──────────────────────────────────────────────────────────────────
-from geo_tools.analysis.spatial_ops import (
-    buffer_and_overlay,
-    nearest_features,
-    overlay,
-    select_by_location,
-)
-from geo_tools.analysis.stats import (
-    area_weighted_mean,
-    count_by_polygon,
-    summarize_attributes,
-)
 
 __all__ = [
     "__version__",
     "settings",
     # utils
     "get_logger",
-    "set_global_level",
-    "is_valid_crs",
-    "validate_crs",
-    "validate_geometry",
-    "is_supported_vector_format",
-    "validate_vector_path",
-    "SUPPORTED_VECTOR_EXTENSIONS",
-    # io - readers
-    "read_vector",
-    "read_gdb",
-    "list_gdb_layers",
-    "read_gpkg",
-    "list_gpkg_layers",
-    "read_csv_points",
-    # io - writers
-    "write_vector",
-    "write_gdb",
-    "write_gpkg",
-    "write_csv",
-    # core - geometry
-    "is_valid_geometry",
-    "fix_geometry",
-    "buffer_geometry",
-    "centroid",
-    "bounding_box",
-    "convex_hull",
-    "intersect",
-    "union",
-    "difference",
-    "symmetric_difference",
-    "unary_union",
-    "contains",
-    "within",
-    "intersects",
-    "distance_between",
-    # core - projection
-    "WGS84",
-    "CGCS2000",
-    "WEB_MERCATOR",
-    "CGCS2000_UTM_50N",
-    "get_crs_info",
-    "crs_to_epsg",
-    "transform_coordinates",
-    "transform_point",
-    "suggest_projected_crs",
-    # core - vector
-    "reproject",
-    "set_crs",
-    "clip_to_extent",
-    "dissolve_by",
-    "explode_multipart",
-    "drop_invalid_geometries",
-    "spatial_join",
-    "add_area_column",
-    # analysis
-    "buffer_and_overlay",
-    "overlay",
-    "nearest_features",
-    "select_by_location",
-    "area_weighted_mean",
-    "summarize_attributes",
-    "count_by_polygon",
+    "set_global_level"
 ]
diff --git a/geo_tools/config/settings.py b/geo_tools/config/settings.py
index 7ecffcf..41512a7 100644
--- a/geo_tools/config/settings.py
+++ b/geo_tools/config/settings.py
@@ -42,7 +42,7 @@ class GeoToolsSettings(BaseSettings):
     """日志文件目录。"""
 
     # ── 坐标系配置 ────────────────────────────────────────────
-    default_crs: str = "EPSG:4326"
+    default_crs: str = "EPSG:4490"
     """默认地理坐标系，使用 EPSG 代码字符串。
     常见值：
     - ``EPSG:4326``  — WGS84 经纬度
@@ -51,7 +51,7 @@ class GeoToolsSettings(BaseSettings):
     """
 
     # ── 日志配置 ──────────────────────────────────────────────
-    log_level: str = "INFO"
+    log_level: str = "ERROR"
     """日志等级：DEBUG / INFO / WARNING / ERROR / CRITICAL。"""
 
     log_to_file: bool = True
diff --git a/geo_tools/core/projection.py b/geo_tools/core/projection.py
index 5e07120..cbd424e 100644
--- a/geo_tools/core/projection.py
+++ b/geo_tools/core/projection.py
@@ -13,13 +13,6 @@ from geo_tools.utils.logger import get_logger
 
 logger = get_logger(__name__)
 
-# ── 常用 CRS 快捷常量 ──────────────────────────────────────────────────────────
-WGS84 = "EPSG:4326"          # 地理坐标系（经纬度）
-CGCS2000 = "EPSG:4490"       # 中国国家大地坐标系 2000
-WEB_MERCATOR = "EPSG:3857"   # Web Mercator（米）
-CGCS2000_UTM_50N = "EPSG:4508"  # CGCS2000 / 3-degree Gauss-Kruger zone 50N
-
-
 def get_crs_info(crs_input: str | int) -> dict[str, str | int | None]:
     """获取 CRS 的基本信息。