Rock thin section identification is applied in the field of geology, possessing advantages such as simple, economical, and rapid identification methods. However, in practical work, traditional rock naming and the further classification of plagioclase, amphibole, and pyroxene are still determined through manual calculation and plotting methods, which are cumbersome and inefficient. The Rock Thin Section Identification Assistant System combines traditional naming and plotting methods with computers. Based on the measurement and identification methods proposed in relevant textbooks and papers, it uses the VB 6.0 programming language to achieve human-computer interactive operation. It features straightforward operation and intuitive display, improving work efficiency and identification accuracy, and holding significant practical value for rock thin section identification.