In response to the energy and economy requirement of China, the high and stable production of Tarim oilfield is directly connected to the oil supply and economic growth. So far, some blocks have entered a new development stage with high water cut and high oil recovery. Finding suitable substitute technique is of important significance for slowing down the production rate decline, and maintaining the stable production of crude oil, and reducing our dependence on imported oil. The Tarim oilfield is rich in natural gas, however, it has disadvantages, such as high pressure high temperature, high salinity and high content of calcium and magnesium. Consequently, based on the geological features of reservoirs and development status, the development situation of Tarim oilfield now facing is analyzed, and technical ideas of gas injection to enhance oil recovery are proposed. In view of the existing problems encountered in the study and applications of gas injection, and for the improvement of crude oil displacement performance, six suggestions, such as optimization of gas source and target block, preparation of gas injection, selection of injection types and methods, physical and numerical sim? ulation and gas injection formulating, field test and matching techniques, and gas storage theory are introduced to develop oil reservoirs.