Abstract: UAV has the advantages of small volume, low consumption and light weight etc. Based on the principle of passive location, precision analysis for UAV multiple observers passive location based on pseudo-DOA is proposed in this paper. The principle of passive location is introduced and its location precision is deduced in detail. Then the influence of baseline length of station distribution and time interval to adjust station address are simulated and analyzed. Finally, several constructive suggestions to improve the target positioning accuracy methods-increasing the distance between stations and reducing the time interval of the station calibration.