In order to study the influences of end constraint and charge length on the jet formation of single angle cuneiform cover liner shaped charge(LSC) cutter, a three-dimensional full-scale model of charge was established by using ANSYS/LS-DYNA program. The jet formation photographs of different time was reorded by X-ray technique. Results show that the image shape of simulation almost is same with X-ray test. The jet mass and jet velocity were declined because of end constranint. The influence of end constranint on jet formation was different with different charge length. Jet can hardly form when the charge length was less than 20 mm. When the charge length was greater than 20 mm and less than 70 mm, a stable jet can form in charge length range and maximum jet velocity increased gradually to a certain level for a certain length of charge. To minimize the adverse effect of the end constranint on the jet formation, charge length should be greater than 70 mm.