Testlet response theory is a branch of Item response theory .It was widely applied in practice .We introduced detailedly various common dichotomous credit models in this theory and methods for parameter estimating the parameters of the models ,summarized the relationships between of these models ,compared the advantages and disadvantages of these methods .The purpose was to provide basic theory support for further theory and application research .%题组反应理论是项目反应理论的一个分支，在实际中有广泛的应用。详细介绍了该理论中常见的各种二级计分模型以及估计模型参数所使用的几种方法，总结了各种模型之间的关系，比较了所使用的几种参数估计方法的优劣，冀其能为题组反应模型的理论和应用研究提供一定程度的理论支撑。
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