Abstract: Heating in the strain clamp drainage plate often causes serious accidents such as power failure. In order to solve the heating problem of drainage plate, it is necessary to reduce the electrical contact resistance between the joints. TiNi shape memory alloy is a kind of functional smart material with unique shape memory effect, the shape of the alloy can be restored with the change of temperature. The shape memory effect of TiNi shape memory alloy gasket was briefly introduced.The joints are fastened by changing the shape of the shape memory alloy gasket effect in the early stage of heating of the drainage plate, the contact area is increased so as to reduce the heating and failure rate of the drainage plate and realize the safe and stable operation of the strain clamp.