Purpose/Significance Aiming at the difficulties and challenges faced by the safe and open sharing of patients’ personal electronic medical records (EMR) data in the internet open scenario, the purpose of the study is to design a set of security sharing model to promote medical institutions realizing the open sharing of patient EMR and electronic health records (EHR). Method/Process The key factors affecting the open sharing of patients’ personal EMR data are analyzed, and the open scope, standard and format of EMR data in the internet medical scenario are determined. A secure sharing model of patient EMR data is established by using blockchain technology. Result/Conclusion The construction of patient EMR data security sharing mode based on blockchain can initially realize the trusted storage and safe open sharing of patient EMR data and provide new ideas for the safe open sharing of medical health data with EMR as the core in the future.