Abstract: At present, there are too much basic data for the calculation formula of gas deviation factors of high sulfur gas ields, also the calculating process is too complicated with low reliability. Through the high-pressure property test of actual gas sample of nine mem- bers of ive representative gas wells in the high sulfur gas ields in northeastern Sichuan, deviation factors under different temperature and pressure are obtained. Experimental results are analyzed. Comparative calculation is conducted by using the commonly used empirical formula of deviation factors. The adapt degree of the empirical formula to the high sulfur gas ields in northeastern Sichuan is evaluated. Results show that the there is positive correlation between the gas deviation factor and the gas well depth under original conditions of the high sulfur gas ields. When the pressure is higher than 30 MPa, there is linear relationship between the deviation factor and the pressure.