Abstract: In order to solve the problem of inaccurate determination of coal seam gas content, the adsorption and desorption characteristics of briquette coal at different temperature were studied. The results showed that the adsorption constants which are a and b increase rapidly with the decrease of temperature. Under the same temperature, the desorption amount of briquette coal increases with the increasing of time. The high of the adsorption equilibrium pressure is, the greater the desorption amount of briquette coal is. The relationship among desorption amount Q of briquette coal and time t, temperature T and pressure p meets the function of Q=（（Ｃp+D）T+ep+f）t^(hp+g)T+mp+n, and C, D, e, f, h, g, m are fitting constants.