Weld shape of TC4 titanium alloy thick plate by electron beam welded is investigated experimentally. The effects of different welding parameters on weld shape is analyzed. It is found that the focus current has a large influence on weld shape, and change of focus current leads to difference of weld shape. The effect of welding speed on weld shape is less than that of the focus current. The integral shape of weld differs, but there is no much greater change in weld shape with changing welding speed. Beam current has a little influence on weld shape. With various beam current, the change of weld shape approximates integral reduction and enlargement.