Analysis records of coseismic response which recorded by the same instrument but the sampling ratio is different, and found that there are mach difference not only in morphology but also in capabilities and response amplitude. Second sampling rate data can be better recorded coseismic response. In order to record the true , complete and reliable coseismic response, observation instruments should make improvements in sampling ratio, data storage capacity, GPS time, the trigger threshold, the reader way of the hour and minute value. At last, we indicade coseismic response analysis will be a breakthrough research direction to earthquake analysis and prediction in the future.