Abstract: A method of constructing the intelligent computer systems based on information reasoning, the method comprising the steps of: obtaining the problem from the users and analyzing the corresponding user demands; choosing the data relating to the user demands in databases and collecting the external data for solving the problems; preprocessing the data and generating the data tables; computing the field of probability on the basis of data tables; computing the degree of credibility of the information reasoning rule according to the new information theory; outputting the information reasoning rule “if A, then B” and its degree of credibility; storing the results of the discovered information reasoning rules. The intelligent computer systems constructed by this patent can extract information from the large amount of data automatically.