In order to realize the monitoring of the aircraft wake vortex effectively, solve the puzzles of flight safety and runway capacity limitation, an algorithm of wake vortex parameter extrication based on Lidar echo is proposed. The physical model of circulation and radial velocity distribution is studied, and the structure of wake vortex is descripted. Based on the features of the vortex parameters, the flowchart of parameter extrication is given, as echo signal processing for noise reduction, threshold selection for velocity envelopes to resolve the velocity distribution and parameter(core radius, core position, circulation) extrication. Moreover, the calculation example of extrication algorithm is carried by taking a certain type of aircraft for example which is compared with the model simulation. The experimental result verifies the effectiveness of the extrication algorithm.