To ensure the safety of the factory building structure,it is necessary to conduct safety appraisal and structural reinforcement of the factory building when adding photovoltaic panels to the roof of a steel struc-ture factory building with gabled frames.Taking a certain factory building as an example,in this paper,the identification and reinforcement procedures were systematically introduced.The factory building was inspected and identified from different aspects such as component size,steel strength,construction investigation,and load investigation.Finally,based on the inspection results,the bearing capacity of the structure was checked and the identification conclusion was given.According to the appraisal results,corresponding reinforcement methods were adopted in accordance with"Standard for design of strengthening steel structure"(GB51367-2019)to re-inforce the factory building,and ensure the structural safety after adding photovoltaic panels.