The district collaborative design is an advanced design organization mode. The problem of definition and expression of correlation in collaborative design is aimed. The organization characteristics are analyzed based on district collaborative design space. The connection relationship acyclic graph which includes connection semantics is achieved and the relationship specialty and connection mode are explained. The algorithm is proposed to solve correlation for district collaborative design by use of correlation information model, and the correlation management model based on PDM is illustrated. Finally, a case study is conducted to prove these theory and method.