The influence of large crosssection rectangular EPBtype pipe jacking tunnel under South Renmin Road on below operating metro tunnel deformation is analyzed; and then comparison between simulation results and monitoring data is made to verify the rationality of the simulation model. Some conclusions are drawn as follows: (1) The vertical deformation of the below existing metro tunnel induced by the construction of the pipe jacking tunnel is greatly affected by supporting pressure of excavation face in the early stage; and it is mainly affected by excavation unloading effect as the excavation face moves forward. (2) The horizontal displacement of the metro tunnel is affected by supporting pressure of excavation face and excavation unloading effect; and the upper crosssection of metro tunnel segment lining is significantly affected by supporting pressure of excavation face.