The purpose of this article was to discuss the role of phonological processing on word recognition of the second language that has been indicated in the first language. In the first section, the history of bilingual memory representation researches were reviewed. Some problems were described based on the criticism of the previous researches reviewed and the words type effects investigated in cross-languages. Then, after referring to the role of phonological processing on word recognition of the first language, the neglected roles of phonology on bilinguals' lexical processing were discussed based on introducing the previ-ous researches. Finally, some proposals for the phonological processing researches on bi-lingualism were discussed.