经典测验理论 (CTT)的主要缺点有 :对测题难度、区分度及测验信度的估计依赖于被试组 ,对被试能力的估计依赖于所使用的测验题目 ,只提供平均测量精度等 .而项目反应理论 (IRT)则有参数不变性的优点 ,并能给出不同水平被试的测量精度 .CTT有使用方便的优点 ,而IRT的理论体系尚需进一步完善 .二者将互相促进 ,共同发展 . The main shortcomings of CTT are as follows: the estimation of test difficulty, discrimination and test reliability depends on the test group, and the evaluation of test ability depends on the test questions used, only the average measurement accuracy etc. (IRT) has the advantage of parameter invariance, and can give the measurement accuracy of different levels of subjects.There is an advantage of using CTT conveniently, and the theoretical system of IRT needs to be further improved. ,Develop together .