Abstract: Aiming at the problems of error-prone size labeling and high difficulty in manual inspection of SolidWorks engineering drawings, a technology for SolidWorks engineering drawing size redundancy inspection is proposed. As the development tool, VB.NET is used to carry out the secondary development of SolidWorks. The view information and dimension information in the drawing are obtained by calling the API function in SolidWorks, the data is stored and read with SQL Server database. The comparison method is used to check the size duplication and size chain closure in engineering drawings, and the error size is highlighted in the drawing. The feasibility of this method is verified through taking the typical parts of the refrigerated truck as the object. The technique greatly reduces the checking time and design error rate, and improves the design efficiency of the staff.