Abstract: Xiaermen oilfield north block shallow layer H 2Ⅰ3 layers is extra heavy oil reservoir with gas cap, oil ring and edge water. Out edge water flood, sand carrying cold production(by screw pump) and steam huff and puff have been applied, which obtained certain development effect. In order to improve the producing degree of reserves, using the numerical simulation method to predict different development way and the effect. It is thought that the direct steam flooding is superior to steam huff and puff and intermittent steam flooding. The converting steam flooding technology feasibility and effect were analyzed in the paper.