As the most important technical support to digital transportation and intelligent transportation system (ITS),
Geographical Information System (GIS) has become an important tool for traffic safety assessment, management and
accident prevention. In this paper, the key techniques, system design method and implementation strategy of Traffic
Safety Analysis and Assessment System (TSAAS) is investigated based on the integration of GIS and traffic safety
models. TSAAS takes road segment as basic units and uses node sets and directed edge sets to describe road network.
Event driven spatial data model is adopted to organize information about traffic accidents in order to link accidents with
road network data. In order to solve the problem of data storage, Microsoft SQL Server2000 is used as the basic database
platform and SuperMap SDX+ large spatial database engine is used. Traffic safety analysis modeling is usually based on
many random accident events, and the results are expressed by certain numerical criteria. Taking two typical traffic
safety models: black point model and traffic safety assessment model as examples, the integration of traffic models with
GIS is explored in detail. Finally the implementation strategy of TSAAS is investigated, and the secondary development
scheme based on ComGIS product, SuperMap Objects, is recommended.