In allusion to the laser echo signal measurement requirement of space target，this paper analyzes velocity aberration，sets up vertical measurement coordinate system on laser tracking and measurement equipment，calculates coordinate formula of the laser echo spot center location，presents the calculation method of the laser echo spot center location .A calculation example has been presented，its calculation result has been analyzed.This fomula and calculation method can be used for estimating the laser echo spot center location,evaluating the laser tracking and collimation ability for space target.