In order to meet the multi position initiation requirements of multi-mode warhead, the laser fuze needs to simultaneously achieve multi-ranging distances from 1 m to 25 m. For the noncoaxial laser fuze, the range of the detection distance is closely related to the system parameters. Based on system detection distance requirements, the working distance calculation model of the noncoaxial system was established, the influence of the system parameter changes of the laser fuze on the nearest working point and the furthest working point was analyzed. The receiving deflection angle and the center distance between the transmitting and receiving system were variables. In the case of satisfying the constraints, the multi-island genetic algorithm was used to optimize the variables. The optimization result shows that, under the condition of satisfying the constraints, the minimum receiving deflection angle is 90.97°, and the center distance is 0.03 m. The experimental result shows that the designed system parameters can completely meet the requirements of multi-ranging distance. The research can provide reference for the parameter design of laser fuze system with multi-ranging.