Abstract: The log system plays a key role in ensuring the safety management and proper use of hazardous chemicals in universities labs. However, traditional centralized log systems often face risks of tampering and malicious manipulation. Based on blockchain, this paper designs a log system for the management of hazardous chemicals in university labs, constructs flexible and efficient log data writing, storage, and reading operations, and implements a prototype system based on Hyperledger Fabric. The system can ensure the immutability, transparency and fairness of the log data of hazardous chemicals, and has positive significance for improving the safety management in university labs.