Laser fuse is an important part of modern laser homing system.The technology is rarey used in airtoair missile.The applicatiaon investigates the design of analog filters and DSP filters that reduce the influence of extraneous noise in data acquisition systems.The pulse constantcurrent source for the semiconductor laser is designed.Mathematical model for precision analysis was formulated to evaluate the performance of the presented approach.A contrast was given to test the effectiveness of the method.The experiment results show that the noise of drive source is reduced by 50% in the inproved control, which is specified as high control precision and good stability.