To help solve the inaccuracy of current protection system reliability assessment due to lack of basic data， this paper proceeds from the characteristic of protection system reliability analysis. The framework of the protection reliability data acquisition system is discussed， the sources and form of data collection is analyzed and the basic table format for data saving is designed to satisfy data collection and integration as well as the subsequent calculation and analysis. Finally， the 3F technology is introduced into protection reliability assessment and a discussion is made on the integrated application of failure mode effect analysis（FMEA）， fault tree analysis（FTA） and failure reporting as well as the analysis and corrective active system（FRACAS）.