With the development of urban rail transit works, cases of transfer between new Metro station and existing Metro lines increase. As a result, easy and safe transfer becomes more and more important. The passenger flow under normal conditions and that in case of incidents are simulated by means of LEGION passenger simulation technology, so as to evaluate the transfer program. The evaluation results are then fed back to the design so as to make optimizations. The paper can provide reference for the design of similar projects in the future.