Abstract: Computerized adaptive testing has been subject to security problem in practice. To solve the problem, the researchers at home and abroad have done a lot mainly in two ways. One is to impose a maximum exposure rate of items in the bank that no item could exceed, which includes SH method, item eligibility method, multiple maximum exposure rate method and so on. The other is to improve item selection strategy, which involves -stratification method and its alternations. Furthermore, the two solutions have been integrated in recent years. In this article, the author will discuss the advantages and disadvantages of these methods focusing on MSE and bias, test overlap rate, utilization rate of item bank and so on. Finally, development history and research ways of the test security method are summarized, and future research trends are forecast as well.

Key words: test security, SH method, item eligibility method, multiple maximum exposure rate method, -stratification method