For applying the radar velocity data to test the results of numerical model, a new method is presented to save the wind vectors of 3D numerical model as the radial velocity in the base data format of radar, and to get the simula ted radar velocity display as radar volume scan in different inclination with th e same color tab of the operational radar. Based on this method, the velocity pr oduct of radar can be used to test the 3D wind field simulated by the model. Thi s method can help the programmer to find directly the difference between simulat ions and observations during the simulation process.