Abstract: The handoff mechanism, a key technology to support the user seamless mobile services in wireless communication system, has a great impact on users services experiences and application. This paper presents the auxiliary handoff mechanism based on context and particle filter algorithms, using particle filter algorithms to predict the mobile station location next time accurately, the user context information plaies an auxiliary supporting role. This method is a pre-handoff decision-making mechanism, to provide fast, accurate and reliable basis for decisions, and reserve resources in advance, significantly improve the QoS of network. Theoretical analysis and simulation results show that location prediction is closer to true trajectory of the user, the RMSE of position and velocity is smaller, greatly improve the success rate of handoff.