An optimal path generation method of UGV(Unmanned Ground Vehicle) on real-time environment is proposed and demonstrated through MATLAB simulations. Among various functions of UGV. real time obstacle avoidance is a key issue to realize realistic scenario in FCS (Future Combat Systems). A narrow corridor like environment is considered as a simulation. For each step of UGV movement, three objectives are considered : First is to minimize the distance to the target, second to drive the UGV as the shortest free space and third to generate tangential direction to the obstacle. A weighted objective function is used in the optimization problem. Equality and inequality constraints are taken to secure the UGV’s dynamics and safey. The weighting factors are controlled by the fuzzy controller which is constructed by a fuzzy rule set and membership functions. Simulations are performed for messy environment and narrow corridor like case. The results are satisfactory for realistic situations considered. The proposed optimal path generation method with the fuzzy controller is expected to be well applicable to real environment.