Abstract: Rock thin section identification is applied in the field of geology. It has advantages such as simple, economical, and rapid identification methods. However, in practical work, traditional rock naming, as well as the further classification of plagioclase, amphibole, and pyroxene, are still determined through manual calculation and plotting methods. These methods are cumbersome to calculate and have low efficiency. 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 VB6.0 programming language to achieve human-computer interactive operation. It features simple and direct operation and intuitive display, improving work efficiency and identification accuracy. This system has important practical significance for rock thin section identification work.