Geologic methane microseepage,an important contributor to atmospheric greenhouse gases methane budget, has recently become a research focus of global environmental change. Methane emission fluxes from different types of oil/gas reservoirs were significant difference. The Dawanqi field in Kuche depression (Tarim Basin, Xingjiang Province, China), as a typical shallow oil/gas reservoir, will be selected as the area of study. Firstly, by monitoring temporal and spatial variation of methane emission from the Dawanqi reservoir, emission fluxes of microseepage methane in the shallow oil/gas reservoir will be used for developing prediction and evaluation models.Secondly, based upon our previous methane flux studies of microseepage methane from the deep oil/gas reservoirs in the Tarim Basin, the overall contribution to atmospheric methane budget from the Tarim Basin will be predicted reasonably.Finally,in order to shed some lights on the emission mechanisms of microseepage methane from oil/gas reservoirs with varying geologic features and controlling factors in oil/gas reservoirs,computer simulation method will be adopted to evaluate the processes of microseepage and oxidation of methane in saturated zone and unsaturated zones, by taking into consideration the methane fluxes, environmental soil factors,soil gas composition and isotopic characteris- tics. Successful completion of this study will not only provide an important complement to Chinese and global database of microseepage methane flux, but also lay theoretical foundation for more accurately assessing contribute of natural methane emission flux from oil/ gas basins to atmospheric methane budget.