The response characteristics of the detector before and after the laser irradiation are compared. After the irradiation of a higher power but below the permanent damage threshold，for the response of the same signal outputs，the detection system changes greatly. The analysis shows that the detector is processed using the high density laser，the heat dissipation of the detection system is improved. The change of the detector performance before and after the pre-processing is analyzed and the experimental phenomena are explained. This work provides the reference for the design and processing technology of detector and the ability of anti-laser irradiation for the detection system.