The influence of swing movable teeth transmission parameters on its lubrication effect is studied by the theory of elasto-hydrodynamic lubrication. The mathematical model of optimizing swing movable teeth transmission is established by coordinating the objectives of maximizing engaging efficiency and minimizing volume as well as maximizing the film thickness ratio. The global optimal solution is obtained based on chaotic particle swarm optimization algorithm. The result of optimization shows that the method can be used to effectively improve the transmission performances of swing movable teeth drive.