With rapid development of the national open mining coal resources, which generated lots of open-pit slope, and typically coal(rock) layered slope，under the external and internal structure function, it caused massive landslide with time increasing. Large coal(rock) slope deformation is not instantaneous, but rather the result of a long slow rheology, which is the main forms of creep; which is a serious threat to mining enterprise and the safety of workers. Appling the maximum tensile stress theory and establishing the creep rupture judgment criteria, And finite description of the creep cracks initiation, expansion and gathering. Based on FEPG software, programmed creep rupture module, it generated crack at the vertical direction of first principal stress vector, The crack propagation continue to find the maximum of the first principal stress, which achieved tensile strength and creep craze of elements, this process is continuously cycled. In Haizhou open-pit national mine-park, simulated the coal(rock) separation layer creep rupture, and the results of measurement and simulation was coincided; its study provided basis for prevention and disaster of coal (rock) slope.