With the development of network environment and hardware technology, smart devices therefore have become very popular tools. Nowadays, smart facilities are very common in our daily lives. For example, smart refrigerators, smart air conditioners, smart home, smart cities and a large number of applications of Internet of Things have been used. The concept and technology of Internet of Things are being carried out in full swing. Internet of Things in the personal care is one of the concern topics. In order to prevent malicious attacks, resulting in the leakage of patient data, the security of Internet of Things is important. Review the related works about health care service. We found that their article lack of complete security mechanism, therefore we proposed a new architecture which is an IoT-based authentication scheme for personal health care system. In the proposed scheme, doctors can get patients' health status from wearable devices of patients. We complete the goal of electronic medical record sharing. Our scheme can achieve anonymity, mutual authentication, non-repudiation. It can also against forgery attack.