在分析经济规模实质的基础上 ,分析了石油化工企业经济规模的成因 .根据多品种生产企业的特点 ,建立了一种适合于确定石化企业经济规模的多品种生产成本函数模型 .并结合我国石化企业目前的实际情况 ,分析了石化企业在建立经济规模方面应注意的问题 Based on the analysis of the essence of economic scale, the causes of the petrochemical enterprises’ economic scale were analyzed. Based on the characteristics of multi-species manufacturers, a multi-variety production cost function model suitable for determining the economic scale of petrochemical enterprises was established. The current actual situation of the company analyzes the issues that petrochemical enterprises should pay attention to in establishing the economic scale.