Abstract: To research the compressive stability measures of continuous-slab-track on a long-span bridge,based on its structural and longitudinal mechanical features a finite element model for slab-bridge-pier was established by taking a prestressed concrete continuous rigid frame bridge with a span of 94 m+168 m+84 m as an example,and the most unstable segment of continuous-slab and bed-plate was determined.By taking the upward deflection of continuous-slab and bed-plate under a train load as the initial bending defects,the nonlinear compressive stability of continuous-slab-track was analyzed.The research results show that continuous-slab and bed-plate on a long-span bridge are unstable under train and temperature loads,setting a bi-directional block like converse-L can enhance their stabilities,and the suggested distance between two adjacent bi-directional blocks should be less than 16.7 m for the example bridge when the maximum allowable temperature rising is 30℃.