Abstract: By using different methods,the calculation on well spacing density in Ⅶ-Ⅸ reservoirs of Shuanghe oilfield has been carried out and on the basis of this calculation,5 proposals on well spacing density have been deployed.The best proposal with good development and economic indicators has been finally optimized through mathematic simulation and comparative analysis among all these indicators.In the end,taking all advantages and limitations of all kinds of cal culation procedures into consideration,the appropriate well spacing density has been confirmed,providing technical sup-port for the design of field development plan.