针对拼接主镜，开展子镜面共相校正装置的结构设计与性能测试。该装置整体采用粗调精调结合的两级式结构，主要由粗调级、精调级和横向卸载机构等部分构成。文章在基于有限元方法的装置整体设计与性能分析基础上，完成装置样件研制与基本性能测试。实测结果表明：该装置可平移±2.5 mm，校正精度约30 nm RMS（root mean square），带模拟镜面后固有频率约70.3 Hz，与设计结果相符，满足主镜系统技术指标需求。

The structural design and performance test of the sub-mirror co-phase correction device were finished. The device covered two-stage structure and was mainly composed of coarse adjustment stage, fine adjustment stage and lateral unloading mechanism. Based on the finite element method, the overall design and the performance analysis of the device were finished, and then the prototype development and basic performance test were also completed. Finally, the test results indicate that the displacement of adjustment system is about ±2.5 mm, the accuracy is about 30 nm RMS, and the natural frequency is about 70.3 Hz with analog mirror, which are in good agreement with the finite element analysis results. In conclusion, the performance of the design meets the requirements of the segmented-mirrors.