With the informatization of medical data, the Electronic Health Record (EHR) plays an increasingly important role in remote medical treatment and medical research. To solve the problem of EHR interaction in remote medical treatment, this study proposes a cross-organizational EHR interaction platform among hospitals. According to the business process of the platform, the activity and resource elements of each organization are extracted. According to the relationship between the activity and resource of each organization in the interaction process, the activity and resource elements of each organization are extracted from different perspectives of various organizations by combining the polychromatic set and perimeter matrix. At the same time, it studies the business process and proposes the corresponding formal description model.