Rheology mechanism is studied on the whole rheology process of coal‐rock containing gas using rock rheology apparatus in triaxial compression. Experiment shows that there are 3 typical creeping stages including instantaneous creeping stage I, stable development of deformation stage II and accelerated deformation to failure stage III. According to the result of experiment and one‐dimensional creeping constitutive equation, three‐dimensional rheology constitutive equation is derived by analogy and assumption method. Using rheology mechanism of coal‐rock containing gas illustrates the typical process of coal‐rock dynamic disaster in mining.