Because the traditional distance methods can not meet the requirements of high precision in the condition of short distance, a distance system based on high precision interval measurement chip TDC-GP2 is designed in the paper. At first, the working principle of TDC-GP2 is introduced, and then application methods in the distance system of pulse laser fuse are discussed. At last, the hardware and software design of the system are introduced, and the experimental analysis are carried out. Experimental results proved that the highest measurement accuracy was about 65ps. The method can satisfy the accuracy requirement.