Relativization is a common feature shared by almost every language,which also needs to be analyzed from the contrastive perspective.Considering about the NPAH theory,two questions has been solved here:what are the similarities and differences between English and Chinese selativization strategies;whether the data gained from analyzing the corpus could support the NPAH theory.By analyzing the corpus,2 points has been found:1)Relative-pronoun strategy is the most frequently used strategy in English,in spite of Chinese RC has no relative-pronoun strategy.2)The accessibility for English RC with+case strategy starts from IO,but Chinese starts from DO.Generally,both English and Chinese relative clause can support the accessibility hierarchy of the NPAH.