Abstract: At the information-based ages, the establishment of digital library is already the irresistibly general trend. However, facing the heavy network resources, the traditional artificial mark method already leads to lack the ability to do. For this, digital library must adopts the new retrival tool. The retrival tool of the digital library should usher the search engine technique and adopt to combine of the modem automobile mark method and the traditional artificial mark method .

Key words: Digital Library,The Search Engine Technique,Function