Abstract: According to diagenetic sequence, characteristic of oil and gas inclusion and hydrocarbon and saline inclusion of the reservoir, combining illite year measurement and source rock evolution history, this article made comprehensive study on Jurassic gas reservoir petroleum accumulated period and order in Kongquehe region of Talimu basin and concluded that the oil and gas reservoir in Ahe formation of lower Jurassic in Kongquehe area has three oil and gas injecting and accumulating period. The first stage is Yanshan mid - later stage, mainly oil, under middle maturity, heavy oil, oil resource comes from secondary injection after the destroy of poleozoic erathern reservoir. The second stage is early Xishan, about 50 - 40Ma, mainly oil and contains gas, more maturity, light oil, oil resource comes from the deep area. The third stage is mid -later Xishan(20Ma- ), mainly gas, some come from high temperature pyrolysis gas of kerogen and crude oil in lower formation and some come petroleum and natural gas produced from Jurassic formation.