SMA microclamp is a kind of microclamp made of Shape Memory Alloy. It utilize the close and open of the microclamp by the shape memory characteristic of this functional marterial. The energy source of the microclamp is the heat energy

which means the change on temperature of the microclamp

and input/output of the thermoenergy between the microclamp and the outside. This article try to analyse the simple dynamic problem of the microclamp by the thermodynamics. It is considered that when temperature begins to fall down under Ms

martensite and the untransformed mother-phase are in a kind of thermobalance. We try to use the equations in martensite transform to get the mathematical relationship between the dynamics of the microclamp and the temperature

also including some useful results for design and fabrication of the microclamp. We hope these results will form the work principle base for SMA microclamp.