The thrust vector control schemes for solid launch vehicle were compared from the view of launching capability. Three multiple-stage solid launch vehicle schemes with different thrust vector control systems were designed, the ascent trajectory of launch vehicle was optimized by combining augmented lagrangian method with Powell method, and the evaluation results of launching capability were provided. Research results show that, with the same take-off mass of 50000 kg and object orbit of 300km SSO, the scheme using jet thrusts and grid vane achieved heavier lauching capability, 115 kg bigger than the scheme using vectored nozzle, and 70 kg bigger than the scheme using jet thrusts and jet vane, respectively. All the above can provide theoretic reference for scheme demonstration of solid launch vehicle.