Abstract: in this paper,the underlying relationship between nonlinear rheological property of fissured rocks and damage development is studied.Based on the rheological fracturing process analysis for rock fissure damage,a nonlinear rheological state equation coupled with damage evolution is deduced for fissured rocks.The relationship between the nonlinear rheological parameters and the evolution rate of rock fissure damage is revealed by comparing the deduced rheological equation with the phenomenon-based rheological equation. Finally,the suggested model is checked by in-situ displacement measurements of an underground plant.