To effectively evaluate the performance of checkpoint handoff scheme for mobile computing system,a model of process state in the mobile system is presented,and then a performance evaluation model for the checkpoint handoff scheme is proposed,according to the characteristics of mobile computing system.The simulation experiments for three existing logging checkpoint recovery schemes have been implemented by the proposed performance evaluation model.The result shows that the performance evaluation model is consistent with practical cases,which proves its validity.By the proposed model of performance evaluation,the proper checkpoint handoff scheme can be determined for a specific mobile computing environment.