For the problem that the reservoir in desert areas is short of water injection resource, an adaptability and development effect of dumpflooding study was carried out in high permeability sandstone reservoir in Middle East by means of reservoir engineering method and numerical simulation. Based on the definition of “dumpflooding threshold pressure”, the mechanism of dumpflooding was analyzed. To conduct dumpflooding, water layer pressure must attain “dumpflooding threshold pressure” to overcome differential pressure between water layer and wellbore, friction pressure lost in wellbore, water gravity differential pressure in wellbore and water injection differential pressure between wellbore and reservoir. Dumpflooding adaptability in N reservoir of H field in Middle East was demonstrated considering the reservoir condition and its dumpflooding threshold pressure. An expression of dumpflooding recovery was built and applied in N reservoir. The development effect with dumpflooding in N reservoir was further researched using numerical simulation method, the development mode of N reservoir is: depletion at first, then dumpflooding is conducted when production plateau is reached, finally artificial water injection is conducted.