Abstract：Traditional seismic data processing is on the basis of hyperbolic time-distance theory. The papers tudied the impact of velocity analysis and NMO correction based on hyperbolic equation on stack velocity and to time and presented improvement method. First, it is theoretically proved that the correction velocity based on the hyperbolic equation increas ed along with the increased of fset in horizont allayered medium and then the case of horizontal layered medium is analyzed. The results showed that hyperbolic velocity analysis can lead calculated stack velocity to become bigger and is also the same for the corrected to time; the larger the used offset of reflected wave is, the bigger the errors of calculated stack velocity and to time are. Using non-hyperbolic time-distance equation can reduce the calculated errors.
