Abstract: There are consanguineous connections between the paddy field temperature and the methane emision flux．After analyzing four kinds of temperature by gray association，the results show that the paddy field temperature at 5 cm below is the closest one．The methane emision flux attains the max．in the tassel period and attains the min．in the ripe period ．The temperature increasing effect is clearer than the decreasing effect．Finally，the correlativity between paddy field temperature and the methane emision flux submits to the curve of S．