As the limit of fuze space in conventional ammunition, it is impossible to arrange a number of laser receivers. Meanwhile, the system structure should be as simple as possible, so the traditional beam layout cannot be directly applied. Therefore, a new receiving system utilizing the technology of optical large field rotary scanning was proposed. Based on the optical structure of laser fuze and the aspherical optical design theory, a set of multilevel optical focusing plastic lens were devised by using the application software called Zemax. Compared with the traditional singlestage focusing lens, the brightness of center irradiation was enhanced by nearly 8 times, the size of spot was decreased and the energy was centralized, which were shown by the simulation results. Then, a set of aspherical lens were developed as well as the related experiments. The results show that the echo energy of pulsed laser can be effectively converged and the detection range can be enhanced in the system described above. Finally, the large field detection whose circumferential view angle of the target is 360° is well realized.