Water resources information identification has a wide application in different section of water conservancy industry, QR code and its identification as a modern information technology has an important influence on the progress of fast-growing water resource informatization. This paper studies QR code large capacity information identification , hierarchical encryption identification and gives out practical example in relating to computer lab management. The research and application can effectively improve the operation management, file management and asset management of the provincial water conservancy system, as well as improve work efficiency, reduce working errors and lay out the foundation for further extending water application to information terminal.