Jet vane is a way of achieving thrust vector control (TVC). However, solid rocket motors in the wake of the jet vane work will inevitably cause a degree of thrust loss, this will lead to decline SRM performance and shorten missile range. The limitation of difference of individual SRM thrust value and the small restrictions bring difficult to accurate test and evaluate thrust loss. Through numerical simulation, 5DOF dynamic loads and six force dynamometer test, a practical method of testing and analysis method was established, from which more accurate thrust loss data were obtained, this can be referable to jet vane and missile system design.