[目的/意义] 目前在技术问答社区知识交流方面的研究尚不完善，旨在采用数据包络分析法研究技术问答社区知识交流效率，从而发现其不同板块之间存在的差异和变化规律，为改进社区管理和提高知识交流效率提供参考。[方法/过程] 在构建知识交流效率评价指标体系的基础上，以“开源中国”社区15个热门板块为研究样本，基于SBM模型与Malmquist指数计算其知识交流的静态和动态效率值并进行深度分析。[结果/结论] “开源中国”社区15个热门板块之间的平均知识交流效率良好，但板块间差距较大，且总体知识交流效率处于上升趋势，主要是由于技术进步变化指数呈现19.50%的上涨幅度，说明技术振兴是“开源中国”社区知识交流效率上升的主要原因，但出现一定程度管理不当现象并且资源利用率较低。

[Purpose/significance] The current research on knowledge exchange in technical Q&A communities is not perfect. This article uses data envelopment analysis method to study the efficiency of knowledge exchange in technical Q&A communities, and finds the differences and changing laws between different sectors to provide references for improving community management and improving the efficiency of knowledge exchange. [Method/process] Based on the construction of the knowledge exchange efficiency evaluation index system, 15 popular sections of the “OSCHINA” community were used as the research samples, and the static and dynamic efficiency values of the knowledge exchange are calculated and analyzed deeply based on the SBM model and the Malmquist index. [Result/conclusion] The average knowledge exchange efficiency among the 15 popular sections of the “OSCHINA” community is good, but the gap between the sections is large, and the overall knowledge exchange efficiency is on the rise trend, mainly because the technological progress change index increases 19.50%. The increasing rate indicates that technological revitalization is the main reason for the increase in the efficiency of knowledge exchange in the “OSCHINA” community, but a certain degree of mismanagement has occurred and the utilization of resources is low.