Libraries in China are trying to become the 'knowledge service' through space reengineering. The paper,based on a technique to locate literatures through their row numbers, discusses the function of libraries to achieve reciprocal presentation for both entity documents and fictitious documents. This function is first realized in the OPAC system of Wuhan Polytechnic University Library. The research shows that the technique can effectively reduce the barrier of borrowing, greatly improve the efficiency and accuracy of literature spotting, and eff...