The test difficulty rate is directly related to the influence of tests on society and also to the science of test themselves. So how to control the test difficulty rate is a public concern in test administration and professionals. Before the test, its necessary to provide a scientific and efficient tool, which makes all departments have a proof to judge test difficulty rate and adjust the bias. This is just a mean, we are using, to control the test difficulty rate now.%在大规模考试中，试题难度直接关系到考试对社会的影响和考试本身的科学性。如何有效控制试题难度，这一直是考试管理层和业务层所共同关注的问题。在考试前，提供一个科学、有效的工具，使各级都能对试题难度的判断有据可依，对判断的偏差能够得以校准，这是一种有效而可行的控制试题难度的方法。
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