Abstract: A control method of electron beam scanning track and scanning mode was put forward, in which the curvilinear equations describing the electron beam scanning track were established according to the shape of the actual welding seam, the size of scanning region, scanning mode etc., then the equations were discretized to obtain a series of discrete coordinate components which were used to generate the analog signals by D/A, after being magnified the signals were input to the deflection coil to drive the electron beam to move following the predefined scanning track and mode. Not only scanning track can be easity edited according to actual welding requirements, but also the scanning mode can be set easily such as continuous or discontinuous scanning, points and lines scanning, region scanning, any complicated scanning graph etc. This makes electron beam become controllable and movable welding heat sourc, and this method has been used in electron beam brazing successfully.