Gypsum minings use room and pillar method frequently; the creep characteristics of gypsum mine have an important impact on the stability of mined-out area. In this paper

Jinghua gypsum mine is taken as the background

using RC-2000 microcomputer to control triaxial creep test machine to carry out experiments with Jinghua gypsum mine rock under confining pressures of 0

2.5

5.0

7.5 MPa respectively. Creep test data obtained are analyzed

selecting the appropriate model for the test curve

and utilize the stress-strain curves method to obtain long-term strength under different confining pressures. The analytical results elaborate that the gypsum mine rock creep contains attenuation creep and constant creep; attenuation creep appears when the axial stress is small; constant creep and attenuation creep appear when the axial stress is big enough; using Nishihara model to fit the test curve. Results show that Nishihara model can describe the creep mechanical properties of gypsum mine rock nicely; the correlation coefficient R is more than 0.9. The ratio of long-term strength to creep strength is within 0.89-0.95 under different confining pressures

which means that the confining pressure has little effect on the long-term strength. The results findings will provide a basis for studying stability of gypsum mine mined out areas.