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The second peak of natural gas exploration came in the later period of the "Ninth Five Year Plan" in Jizhong depression after it had no news for more than ten years. Certain progress had been made on the study of reservoir forming conditions. In this paper , six genetic types of natural gas have been classified on the basis of their geochemical features and the geological settings of gas reservoirs. Therefore, formation conditions and mechanism for all types of natural gas in Jizhong depression have been thoroughly analyzed and five kinds of reservoir forming models have been summarized. The discovered two kinds of natural gas reservoir forming sequence from coal-formed gas and Tertiary source rock have significant instructive sense to natural gas exploration. The study results have gained well exploration effect in practical application.