According to the feature of the maneuver of military ship

a system structure of the intelligent mobile action of naval ship based on IDSS（intelligent decision support system） was put forward

and detailed implementation approaches about fuzzy reasoning and spatial analysis are discussed.This system structure combined DSS（decision support system） and Fuzzy Expert System

which makes the mobile decision-making of the ship can take advantage of both expert experience and ship mobile math models;the characteristics of nature analysis and quantity analysis are embodied.Furthermore

the spatial technology is introduced to the study of the collision avoiding.The system can use the information of GIS to help make maneuver decisions.