Vehicle monitoring and dispatching system based on GPS/GIS can real-timely know of the vehicle’s status messages such as position, speed and direction. This technology provides a brand-new vehicle management method for people. GIS system for vehicle monitoring in client-side is an important component part of vehicle monitoring system, and researching and developing this system has strong practical significance and application value. In order to meet the actual demand of vehicle monitoring project, by using ArcGIS Engine, Oracle database and Visual Basic6.0, this paper developed client-side software in monitoring center, i.e. GIS system for vehicle monitoring. This paper discussed development process and function integration method of vehicle monitoring GIS system by utilizing some controls such as MapControl, TocControl, ToolbarControl and some component interfaces, including ICommand, ITool, and IToolBarDef, designed system’s technology frame, functions and database for vehicle monitoring GIS system, implemented prototype system, and provided implementation methods of system’s feature and key functions. These functions include the following aspects: (1) Measurement function: coordinate dynamic transforming when measuring arbitrary length or area, implemented snap function by using the cache technology of IFeatureCache interface, achieved better effect. (2) Dynamic display of vehicle’s moving: using self-defined symbol to symbolize the vehicle on digital map, symbol’s direction will change along with vehicle’s moving direction after starting monitoring. (3) Querying and drawing of historical track: provides querying and displaying of historical track in a certain period for one vehicle. (4) Getting the latest position: provides querying of the latest position information and spatial positioning for vehicle on digital map. The results show that the proposed development method is simple and practical, helping to optimize the system structure and improve development efficiency. The system’s functions are easy to use, meeting the needs of practical application. So, it has great reference value for related GIS system construction.