Based on the research on multiple wh-questions by Takahashi,this article holds that MLC should be dispensed with in accounting for superiority phenomena and that,the superiority effects,which are connected with the functional interpretation of the wh-phrases in multiple wh-questions,can be directly deduced from the computation via the Phase Impenetrability Condition.

Within the framework of Optimality Theory, through a grammar test on different types of the simple WH-questions in English, we collect the data of interlanguage produced by the junior middle school students whose native language is Chinese, and investigate the constraint hierarchy of the interlanguage of the simple WH-questions in English produced by native Chinese.