Using helium techaique to find oil-gas pool has been applited for several years.Recently, the authors have just developed a new technique-combination of heliumand argon for oil-gas exploration.The result shows that the abundance of δHe is 5.1-6 μL/L(S.T.P),δHe is from-4% to 16%, average is 2.59%; the values of,40Ar/36Ar in soil gas are 255-325, thevalue of δ(40Ar/36Ar) is from +11 %-11%, average is-0.50%. The research suggests that the anomaly of δHe is related to oil-gas pool, but tEe anomaly of δ(40Ar/36Ar) is rather complex. For negative value of 6(40Ar/36Ar) the more negative it is.the more it is riched in 36Ar, and the more argon is fractionated. As the cap rockabove oil-gas pool is usually cemented by CaCO3, the channel is getting worse with.increasing argon fractionation. That is why tEe negat ive values of δ (40Ar/36Ar) always occur above oil-gas pool.The authors discover that there are eight patterns among He, Ar and hydrocarbon. Different patterns have different significance for oil-gas estimation. According’to their re lationship with each oiLer three kinds of prospect for oil-gas explorationhave been estimated, but the mid-deep gas prospect area is the best.