Abstract: GPS navigation plays an important role in improving the efficiency of forest resources survey,forest fire prevention and afforestation operation design.Based on analysis of the application problem of the common GPS navigation in mountain areas, a self-navigation model was designed including the track navigation model and track selection model. A self-navigation system on PDA was thus developed,which integrated self-collection of navigation information and self-navigation.This system can provide flexible and convenient navigation for people in mountain areas.