Abstract: The varioas kinds of adjustment and travel time conversion should be conducted when dealing with the seismic data by computer. These overelaborate precedures greatly affect the efficiency and quality of pretreatment, ln this paper,it is suggested that the above-mentioned work can be carried out by hardware measure.At the same time,the principle aad method are described, and the design of the key circuit aad the effect in the practice usage are introduced.#br#To accurately realize the above work by hardware measure, the zero signal which is uaccetsary for computing is handled more completely and reliablcly, and reaches up to a higher time precision.The conception, the design of part of circuits and the parameter selection are all introduced in detail.