Abstract: Objective: To ensure that the force transmission by the new type joints is effective and the station safety is secured，the mechanical properties of new type joints of CFST (concretefilled steel tube) column and SCCB (steelconcrete composite beam) for urban rail transit assembled monolithic underground station are studied. Method: A fullscale model is built for the stationin in normal service stage; A dopting insitu tensile loading method, the mechanical properties of the CFST columnSCCB joint under static load is studied; Combined with the mechanical test results, a numerical analysis model is established using fiber units in ANSYS software, and the major parameters of joint stress performance are analyzed.Result & Conclusion: The failure mode of the joint connection area is that the concrete at the column end is crushed and peeled off due to compression, and more cracks developed and propagated at beam top; the loaddisplacement curve and strain analysis verify that the joint failure developed during stages of crack appearance, yield deformation and plastic deformation, and that the prefabricated concrete, insitu concrete and steel are well bonded, indicating good overall performance of the joint. Through numerical simulation and parameter analysis, it can be derived that the strength grade increase of concrete at composite beam joint leads to increased bearing capacity but decreased ductility, and that the flange width of the joint steel has little effect on the bearing capacity and stiffness.