Abstract: The item response theory (IRT) has been considered by some scho-lars as one of the three prime directions of current psychological measu-rement theory. In several respects it is more reasonable than the classi-cal test theory (CTT). This paper, using the 1986 data of the entrance-examinations of Teachers' Colleges in Shanghai, and taking the frame ofCTT, computes the indexes of five multiple-choice items in the mathem-atical papers of science students. Then, basing on IRT, the item charac-teristic curves are plotted and the item parameters are estimated under-logistic models. Thus, a comparative study of the results of item-analysis is made. Some comments are made on the application of IRT and CTT inour practice.

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