Function demand aiming at roundness error detection of a large crankshaft connecting rod was described. Based on . NET platform and SQLite database, using three layers architecture and RS-232 communication standard, the design of roundness instrument detection upper computer software was completed. The software realizes detection crankshaft roundness error and re-solves large parts of the roundness error detection and calculation problems in the current manufacturing enterprises. In the practi-cal application of the verification process, the detection achieves the purpose of real-time, high efficiency and accuracy, which ef-fectively improves the machining quality of oversize crankshaft connecting rod,reduces assembly time, and solves economy, and safety problems caused by the work piece roundness error.%描述一种特大型曲轴连杆圆度误差检测功能需求，基于。 NET平台和SQLite数据库，采用三层架构和RS-232串行通信标准，设计圆度仪检测上位机软件系统，实现曲轴连杆圆度误差的检测，解决当前生产制造企业对该大型零件圆度误差检测和计算难题。在实际应用验证过程中，检测达到了实时、高效和精准的目的，有效地提高了特大型曲轴连杆的加工质量，减少了因工件形位误差引发的装配时间，解决了经济和安全问题。
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