The dynamic reduction of confining pressure of salt rock gas storage surrounding rock during construction period is simulated by uniaxial compression tests and triaxial unloading confining pressure tests. The effect of temperature on dilatancy characteristics of salt rock are analyzed by the unloading tests. The results show that all the tests are the process of stress increasing. Furthermore

both unloading confining pressure tests and uniaxial compression tests have similar deformation stages of dilatancy curves. The similar deformation stage includes the volume compressed segment

the stable dilatancy segment and the accelerating dilatancy segment. Those two types of tests also have the similar compressed limit. However

due to the different loading modes

the ratio of stable dilatancy in uniaxial tests is larger than that in unloading confining pressure experiments. The dilatancy rate and the value of dilatancy are smaller in unloading confining pressure tests. The unloading confining pressure tests have greater dilatancy under the same deviatoric stress. Higher temperature can promote the dilatancy of salt rock. That means the increasing of temperature can make the accelerating dilatancy point appear forward

the initial stable dilatancy segment shorter

the accelerating dilatancy segment longer

the dilatancy rate and the value of dilatancy higher.