Abstract: in order to study the relationship between the indicated gas and the fire area temperature in the fie area of the outcrop of coafeld,a fire area experiment device of the cutcropof the c alield was prepared.Based on the experiment.the paper proposed the sponianeous combustion heating period for coing withthe temoerture of 0~130、130~190 and over 190 ℃ and the indicated gases were CO、C2H4and C2H2 respectively.During a modering combustion stabilied period,Co would be the indicated gas. During the suficaion and temperature reduction period.when the tenperature was 300 ~ 160 ℃ and below 150 C.C2H6 and Co coubd be the indicated gas indiduay .T'he paper analzed the fe astbility of crignard fre disaster coricient R,2 to distinguish the development staus ofthe fre rea and a relatinship equation betwieen the indicated gas concentraton and the fre temperature as well a R2 and fre area temperature was ftied.The resuts showed that th tpe ofthe indicated gas in the fie area of the coaffeld outcrop would be bascally the same to the spontaneous combusion area in the goaf but the lowestemperature ocured would be diferent.the lowest temperature of the coal absoption gas would be high and the lowest temperature cal oxidized gas would below. Based on the relationequation and R2,the temperature and development status of the outcrop fire area in the coalfield could be easily predicted.