Tang Li’s patent, Identification Disambiguation in Databases, was authorized by USPTO, and the patent number is US8799237B2. Tang Li was the second inventor of this utility-model patent. Integrated with the concept of cognitive map in the psychology and the concept of approximate structural equivalence in social network analysis, the invention was based on the knowledge similarity to identify individuals. The invention was based on three assumptions. Specifically, the first assumption is that the individual’s experience combination (including family, environments, education experience and training) is unique. The second assumption is that experience combination reflects and affects the dynamic change of individual’s knowledge structure/hobbies. The last assumption is that if the time division is short enough, the individual’s inner knowledge structure and hobbies can be recognized by the program. This invention can be applied to large-scale customer database for recognizing the research progress and career development of individual scientist/inventor. Also the invention is helpful in international R&D, identifying potential customers, and criminal profiling, etc. Tang Li’ peers have proved that the accuracy of the invention’s result far exceeded other programs. Therefor the Search Technology, Inc., an American high-tech company, bought the invention and realized its business value.