The statistical work of the library includes three stages, namely, statistical investigation, statistical data collation and statistical analysis. (1) statistical investigation should first make a statistical investigation plan, determine the purpose, object, scope and items of statistical investigation, prepare the statistical investigation form of our library, and determine the investigation method. According to the survey time, the methods of library statistical survey can be divided into regular survey and one-time survey. The former, such as the number of registered readers visiting the library and the number of books circulating. According to the scope of investigation, it can be divided into comprehensive investigation and local investigation. The former is a comprehensive survey of library collections, readers, personnel, funds and equipment. According to the survey organization form, it can be divided into statistical report system survey and special survey, in which the latter can be divided into general survey (such as national or regional literature resources survey), key survey, typical survey and sampling survey. ② The arrangement of statistical data is to systematize the original data obtained from the investigation and make it a working process to reflect the overall characteristics and conditions. It is the basis and premise of statistical analysis. The collation of library statistical data can be divided into three categories: periodical statistical data collation, thematic statistical data collation and historical data collation. To sort out statistical data, an outline must be drawn up in advance, including statistical data grouping, statistical data summary (also called statistical data synthesis) and statistical table design. ③ Statistical analysis is a scientific method to classify and study statistical data by statistical methods, so as to reveal contradictions, sum up experience and improve work. It is an important stage to provide the statistical results of the library. Statistical analysis requirements: timeliness of analysis, authenticity and comprehensiveness of statistical data, scientificity of analysis methods and comprehensiveness of analysis conclusions. The steps of statistical analysis are to determine the target and draw up the scheme; Collect information and understand the situation; Analyze and reveal contradictions; Draw conclusions and make suggestions. The methods of statistical analysis include comparative analysis, grouping analysis, dynamic analysis, structural analysis, factor analysis, equilibrium analysis, correlation analysis and index method.