Abstract: After built-in pump house is adopted, track type has been changed, therefore the service reliability of built-in pump house in practice is worthy of attention. Track dynamic analysis model of built-in pump house track system is established, and the dynamic response characteristics of the system are analyzed. On this basis, the lateral bending moment and lateral displacement of the monolithic track bed are taken as the control indexes of the service performance, and the elastic modulus of the track bed, the vertical stiffness of the fastener, the lateral stiffness of the fastener and the lateral damping of the fastener are selected as random parameters. The sensitivity analysis of parameters is carried out by adopting 2k factor experimental design, and the lateral bending moment of monolithic track bed is selected as the target response to evaluate the influence of sensitive parameters on the service reliability of built-in pump house track system.