According to the market demand of heavy powder and particle bags, an environmental protection type paper and yarn compounded bag bottom pasting line was put forward and designed. Through analysis of bottom pasting process, stations were divided legitimately, and mechanical structures were designed. 3 D models were established using Inventor software and motion simulation of key position was carried out to verify its rationality. The results showed that the production line can realize paper and yarn compounded bags pasting with certain size; it has the advantages of simple structure, high efficiency, and energy saving, etc.