//例如,personalDBPath=@"E:\temp\TestDB.mdb", featureClassName="newF"
public void CreateFeatureClass(string personalDBPath, string featureClassName)
{

//创建地理坐标系对象
ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();
ISpatialReference spatialReference = spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(@"E:\temp\Suzhou_1954_3_Degree_GK_CM_120E.prj");//.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);

ESRI.ArcGIS.Geodatabase.IGeometryDef geoDef = new ESRI.ArcGIS.Geodatabase.GeometryDefClass();
ESRI.ArcGIS.Geodatabase.IGeometryDefEdit geoEdit = (ESRI.ArcGIS.Geodatabase.IGeometryDefEdit)geoDef;
geoEdit.GeometryType_2 = ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon;
geoEdit.SpatialReference_2 = spatialReference;

//字段集.
ESRI.ArcGIS.Geodatabase.IFields fields = new ESRI.ArcGIS.Geodatabase.FieldsClass();
ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields;

//逐一添加字段.

ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();
ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
fieldEdit.Name_2 = "SHAPE";
fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry;
fieldEdit.GeometryDef_2 = geoDef;
fieldsEdit.AddField(field);

field = new ESRI.ArcGIS.Geodatabase.FieldClass();
fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
fieldEdit.Name_2 = "WKT";
fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
fieldsEdit.AddField(field);

field = new ESRI.ArcGIS.Geodatabase.FieldClass();
fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
fieldEdit.Name_2 = "SLM10";
fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
fieldsEdit.AddField(field);

field = new ESRI.ArcGIS.Geodatabase.FieldClass();
fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
fieldEdit.Name_2 = "SLM20";
fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
fieldsEdit.AddField(field);

field = new ESRI.ArcGIS.Geodatabase.FieldClass();
fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
fieldEdit.Name_2 = "SLM40";
fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
fieldsEdit.AddField(field);

//通过已有工作空间创建.
ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactory();
ESRI.ArcGIS.Geodatabase.IFeatureWorkspace fws = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)wsf.OpenFromFile(personalDBPath, 0);
ESRI.ArcGIS.Geodatabase.IFeatureClass fc = fws.CreateFeatureClass(featureClassName, fields, null, null, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, "SHAPE", null);
}