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In-situ testing is an ideal technology for improving the precision and efficiency of fabrication.We developed an in-situ subaperture stitching interferometric test system for large plano optics in the workshop environment with high precision and satisfactory repeatability.In this paper,we provide a brief account of this system and the principle of insitu subaperture stitching measurement.Several validation tests are presented,which demonstrate that the developed system is capable of realizing in-situ testing.The size of optical flats can be measured is up to 420 mm × 780 mm,and repeatability is smaller than 0.03λ.The paper also discusses the necessary requirements for a suitable workshop environment for ensuring that the tests are stable and reliable.