IEC 61850 log feature is not yet widely used in engineering practice nowadays， the content of the log such as: the application model， scope and trigger mode of log has been a topic of concern in the industry. From the practical engineering point of view， log interoperability problems encountered in the specific application are analyzed， and proposed solutions are put forward. In the meantime model， transmission， management and analysis of log are explained. Finally， implementation method of log service on server terminal and the concrete application example are given， and interoperability testing in the practical project is passed so， that it can be used widely in future.