Abstract: In view of the limitations of the application of bill of quantities data in the construction industry, this paper proposes a linkage method between the bill of quantities and the standard process library based on mapping, which solves the problem that it is difficult to effectively coordinate the quantity data between different business departments in the construction industry. By analyzing the components of the bill of quantities, combined with the data matching analysis and the establishment of mapping rules, the accurate mapping between the bill of quantities and the standard process library is realized, and the efficiency of data utilization and the accuracy of project management are improved. In addition, the study implements mapping and automatic data processing through the smart construction platform of China Construction First Bureau, and further verifies the mapping rules and relations through specific cases, which provides effective technical support for the digital transformation of the construction industry.