The phenomenon of interlanguage fossilization is widespread in second language acquisition, and it is also an important feature that distinguishes second language acquisition from mother tongue acquisition. The research on petrochemical phenomena has attracted the attention of the research field of second language acquisition. This article mainly defines interlanguage and petrochemical phenomena, expounds the reasons for the formation of petrochemical phenomena, and puts forward suggestions on how to help students overcome rigid phenomena in foreign language teaching to promote foreign language learning and teaching.