Soil’s creep indicates a phenomenon that strain increases with time while keeping soil’s stress stable. Researching soil’s creep properties is very important for confirming soil’s long-term strength; and it is quite popular in recent years. However

a creep experiment costs a lot of time; therefore a simple

feasible and reliable device for soil’s creep properties will boost the research. The soil’s direct shear creep experiment is the simplest and the most intuitive way to research soil’s creep properties. But the experiment just keeps the shearing force stable

in the shearing process

the effective area reduces gradually and the shear stress increases continuously with the shear strain developing

this process is not a proper creep. By adding a simple device on the traditional experiment

the liquid’s buoyancy is used to control the shear stress to keep the shear stress stable in the shearing process. After the corresponding modification of the instrument

we had done a group of contrast tests to check the effect of shear stress controlling. The test results show that it can control the shear stress to a certain level.