The present invention relate to the technical field of periodic maintenance of equipment, and specifically relates to an improved method for periodic maintenance of triggering devices. The method includes (1) information input: the first step is to manually add the information such as the content, period, time and person in charge of the fixed-dimension work of all the equipments to the system; (2) equipment dimension sheet is generated; (3) disposal of equipment dimensioning sheet. The method of the invention makes some improvements on the method comprising the original fixed cycle maintenance: Periodic maintenance is performed for each specified number of hours of operation of the equipment, or a specified maintenance work is triggered if an index of the power generation equipment reaches a specified value, for example, periodic maintenance work for cleaning the filter screen is triggered for each specified value of the differential pressure of the filter screen. And without the needfor thick manuals, efficiency is improved and resources are saved.