Considering problems of long production process and excessive mould numbers and occupation of pressure machine used in production of middling open steel drum, the mould structure was studied and optimal design scheme was proposed in this paper. Requirements of production process were analyzed and the compound mould technology was applied. Through structure research, material selection and optimization of design scheme, rush pressing forces of each mould were calculated and the model of pressure machine was decided. The compound mould with dependable structure and optimal scheme can meet the requirements of production process and realized the purpose of integrated processing. Through structure research and optimization of design, production process was modified, working procedure was unified by applying compound mould. The number of pressure machine was reduced. Production efficiency and economic benefit were improved.