Abstract: A fast and simple method for establishing the reasonable kinetic function of the titled process, g(α) was presented. This consists of.(1) Choosing more possible ones(may be 2 or more) graphically, and calculating corresponding activation energy E by using the following formula:(β: heating rate, R: gas const., T: temperature K) (2) Calculating the activation energy by the following formula at a given a value:(3) Comparing the different values of E obtained in (2) with those obtained in (1) and considering. the rationality, of frequency factor A and thus deciding which g(α) is more reasonable.The kinetic equations, the corresponding parameters and the mechanism of dehydration processes of titled hydrates in vacunm and nitrogen gas had been determined and disccused.