The conflicts of resources among projects exist in the process of multi-project scheduling. Compared with switching among the works in one projects, the switching of the bottleneck resources require much more time typically. So how to make reasonable resource scheduling plan in order to guarantee the final completion time of the projects to be the shortest is a significant problem of multi-project management. Based on the traditional scheduling technology of critical chain of single project, this paper will add the switching time of bottleneck resources among parallel projects in resource buffers as bridges to connect the projects and then choose the best one of different switching schemes. At the same time, the article also improves the traditional project schedule planning graphs. Time Axis critical chain project schedule plan is presented to make it more convenient and intuitive of critical chain project scheduling and control.