Abstract ： Research purposes ： Tushan station of Chongqing urban rail transit loop line is a four - tracked - double station tunnel with single hole excavation span of 21.6 m and double hole interval of 19. 7 m in inclined stratum. The rock stratum in station range has a mature oblique bedding and cross bedding with good connectivity. The both sides of level junction are a rock broken zone with poor associativity. To study the support parameters and construction sequence of the station tunnel, the qualitative analysis of underground cavern excavation stability is made using software Unwedge and three - dimensional construction process simulation is made using finite element analysis software MIDAS/GTS. Research conclusions:(1) According to the results of the above comprehensive analysis, it is suggested that a one?time dismantling support length of the left and right holes can not exceed 6 m and 9 m. (2) In structural plane bedding sliding face pressure side walls and vault hollow bolt should be adopted to pass through the structure surface with large angle. (3)The surrounding rock pressure monitoring should be increased in bias and the pressure side wall of the back. (4) Support design and structural calculation should focus on considering the adverse effect of the bias. (5) The research results in this paper have certain reference value for the design and construction of similar tunnel in steep dip stratum.