With the development of testing and producing technology, condition-based maintenance become more and more popular and inevitable for electric equipments, because of its high reliability and efficiency. And some research about condition-based maintenance has been done for a long time in Chongqing electric power corporation. In this paper some of our research will be shared and discussed. Condition evaluation is the foundation of condition-based maintenance, and on-site testing is the main way to know the condition of equipments at present. The method to evaluate the condition of equipment will be introduced in this paper, depending on the testing data. So a new regulation about maintenance and testing of equipments is necessary, in order to regulate the testing and evaluation for electric equipments. The main idea of this regulation will be presented in this paper. According to the regulation, a software of condition-based maintenance information management system has been programmed, using MSSQL server database, and that this system runs at browser/server mode. This system can synthetically analysis the different information that show the conditions of electric equipment, including testing data, family fault, bad working state and give the evaluation of equipment with numerical value. With the publication of regulation and deep application of the system (CMIMS), the condition-based maintenance would be popularized in the Chongqing grid.