Abstract:Based on the modified elastic and visco-elasto-plastic model,the corresponding relationship of complete rock stress-strain curve and creep equation parameters is utilized,and a creep model with non-linear parameters is set up. By analyzing non-linear creep model and the creep curve,in the local scope,non-linear creep question is transfered into linear one,and the stability condition of the modified model is obtained,with which the three stages of rock sample creep,especially the non-linear accelerating creep stage can be described clearly. Meantime,the creep stability criteria of rock sample,analytic expressions of the creep deformation,the creep speed and the creep acceleration are given.