Abstract: Instead of the original wind-head laser seeker, the gyro-stabilized seeker is used in new generation laser guidance bomb widely. In order to improve the acquisition probability of seeker, based on the analysis of different working mechanism between the two kinds of seeker, the influence on target acquisition probability was studied, which caused by the trajectory deviation and attack of angle from autopilot working error in the phase of zero-command planning flight. The theory of seeker acquisition ground zone was given. The relative distance error between the nominal center of acquisition ground zone and the target position was calculated and used as the bombing range modifying method of firing table, in order to decrease the influence of trajectory deviation caused by disturbance on acquisition probability. The simulation shows that the acquisition probability can be improved with the new firing table.