Steering accuracy of liquid crystal phased array (LCPA) is effected by kinds of factors. The paper analyzes some important factors that affect steering accuracy of LCPA, and a steering accuracy correction algorithm is proposed. The algorithm uses approximate slope of phase in a single electrode instead of slope of fitting wave front to decrease difference between approximate slope and ideal slope in the way of adjusting voltage staircase constantly, that reduces accuracy error and improves steering accuracy. Simulation results show that normalized accuracy error can still be reduced by more than 95% under the condition of minimizing accuracy influences by reasonable parameter setting, and steering angle is improved significantly; Meanwhile the maximum phase delay can limit the range of phase realization and further effect performance of algorithm. Appropriate maximum phase delay can achieve phase accurately and enhance performance of algorithm.