OGC web service provides an important method for GIS data sharing and interoperability. But it is difficult to find suitable web service, how to get appropriate service has become a serious problem. We discuss the method of finding web services, filtering unsuitable web services and invoking web services. To find WFS and WMS web services, several search engines' source code are used, then keywords in found page are analysis, and SVM based on importance factors is used. By this way, GIS service finding and filtering become automatic. Practice shows OGC Web service found by this method can satisfy user better.