Abstract: In order to correct the error between wind field information measured by a tilt lidar and the actual wind field, after analyzing the measurement principle, placement and exist problems of laser radar, theoretical calculation was carried out based on space coordinate transformation method and correction formula was put forward. After comparing the measured data of laser radar located at horizontal position and lateral tilt 7.2°, it was found that the error of vertical airflow data measured by tilt lidar was larger. After modification, data curve is in good agreement with the modified algorithm. The results indicate that could get the real wind field information can be obtained correctly based on space coordinate transformation algorithm for tilt lidar. Correctness and feasibility of the algorithm are proved.