As the development of computer technique and Artificial Intelligence, the exam paper generating system is more and more paid attention to by a lot of scientists. It not only comes down to the establish of mathematics model, but also relates to the applied arithmetic. The author analysis a great deal of articles, based on Genetic Arithmetic, aiming at the Auto generating exam paper question of examination system, builds a suitable mathematics model. Based on the overlapping population of GA, the paper improved two coded methods: binary coded method and matrix coded method. Using these two methods on the auto generating exam paper. We find the advantage and disadvantage of the two coded methods.The exam paper generating system refers to lots of theories itself, the author mainly use Genetic Algorithm to research a algorithm to settle the questions of test system, and how to confirm property values of test question storeroom. Because of the importance of algorithm on intelligence teaching system theory research and fact applying, our research is necessary, it is the basis of building a perfect system about intelligence Computer Assisted Instruction.
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