随着国家教育事业的发展，近年来社会上的各种考试发展迅速，如计算机等级考试，四、六级考试，职业技能鉴定，高自考等。这些考试往往决定着一个人的事途发展，所以参加的人数也是逐年增加。大型考试的发展必然离不开题库的建设，而题库的建设过程中测验等值是非常重要的部分。此论文就是在职业技能鉴定题库的建设过程提出的。但目前这些已经建好的考试系统题库主要还是以经典测量理论（Classic Testing Theory，CTT）为基础，然而由于CTT本身存在的缺点，已经不再能满足现在对考试公平性和准确性的要求了，因此为了克服CTT的这些不足，也为了更好的体现被考者的真实水平，项目反应理论应运而生。那么在建立以项目反应理论为基础的IRT题库的过程中测验等值也是不可缺少的一部分。本文主要对以项目反应理论（Item Response Theory，IRT）为基础的测验等值方法进行了深入研究。并通过实际数据的收集和实验验证具体介绍了IRT的等值过程。本论文研究的第一个问题是：等值方法的研究，介绍了等值的基本概念和几种常用的等值方法。本论文研究的第二个问题是：三参数LOGISTIC模型的等值方法即项目特征曲线法的计算机求解过程。并介绍使用此方法通过铆测验的形式如何编制等值的计算机程序。本论文研究的第三个问题是：测验等值的实证研究过程。通过组织学生测试、数据分析、模型拟合、参数估计等部分详细的介绍了等值的过程，并对此过程中出现的问题进行分析和解释，最后给出了等值结果。本文的创新点主要在以下几点： 第一：现在很多等值研究都是使用模拟数据来进行的，可是模拟数据所得出的结论还是和真实的数据有一定差异的，那么它究竟能不能用于实际的测验还不太清楚。所以本文采用了实际数据来研究等值问题，使等值的结果更具有客观性。第二：现在很多的等值研究都是对不同等值方法的比较，至于等值算法的具体求解过程很少有人介绍。在等值的时候也多是采用别人已经编制好的等值程序。那么在本文中主要分析了等值算法的具体求解过程，给出了完整的计算机等值程序编制过程。第三：在文章的最后还进行了特质分数和真分数的等值，并给出了最后的等值结果。这也是很多文章中没有提到的部分。

With the development of education, the various examinations are developed rapidly in recent years, such as Computer Level Examinations, CET, vocational skills identification and Adult College Entrance Examination. These examinations affect the future of a person’s development, so more and more people are involved in these examinations year by year. Item Bank Construction is critical for the development of large-scale examination, and test equating is a very important part in the process of Item Bank Construction. However, these tests that have been built are mainly based on classic test theory (CTT), now they no longer meet requirements of the test fairness and accuracy because of the shortcomings inherent in CTT. In order to overcome the deficiencies in CTT and reflect the true level of the test better, item response theory was formed. This article explores IRT test equating through the actual data collection and experimental verification.The first part is: to introduce the basic concept of the test equating and several common methods. The second part is: to find a equating calculation of three-parameter logistic model, that is, to present calculation method of item characteristic curve. As a result we design and implement computer program by this method.The third part is: to validate the consequence by experiments. Experimental data has been analyzed and interpreted. Finally, results have been given out. Feature of this article as below: First: This article is based on actual data rather than analog data.Second: I design a test equating algorithm and implement the computer program. Third: Have got some conclusions on equating between trait scores and true scores.