| Interlanguage petrochemical problem is one of the hot spot of language learning and research. Selinker summed up several causes of interlanguage fossilization, his work become a cornerstone of interlanguage fossilization research work. Worldwide, after he has formed the broad study of interlanguage fossilization, since for the study of interlanguage fossilization has decades of history. Based on the theory of interlanguage fossilization research achievement for reference, this article from the definition of interlanguage fossilization and the cause of the five aspects are described, the causes include the negative transfer of mother tongue and target language rules excessively simplified or generalization, language input is not reasonable, communication strategy use undeserved, learners’ personal factors. From the characteristics of Chinese elements of ontology, the characteristics of the Chinese writing and teaching Chinese as a foreign language writing these three aspects to describe the characteristics of Chinese as a foreign language in writing the characteristics of "teaching" and "learning". Adopts the way of collecting data from field investigation and test, the bohai university’s school of international exchange of 40 students from South Korea intermediate class of interlanguage fossilization from investigation, the purpose is to understand the interlanguage fossilization of Korean students in Chinese writing shows some situation, selected the south Korean students Chinese writing often some of the vocabulary and grammar mistakes, edit into test questionnaire, analyze the questionnaires show that data can be found that after the interlanguage fossilization in the Chinese writing of students is widespread, this phenomenon is different from the errors of contingency, is a regular, fixed, therefore can be defined as petrochemical. In addition, through the investigation and test, also can draw a conclusion, that is with the student to study the level of ascension, in the writing of fossilization can be improved, the conclusion and the conclusion of interlanguage petrochemical research institute that is accord with. Then adopt the way of case analysis, the choice is in bohai university study for two years Chinese college of international exchange, 19 years old Korean girl further evidence of the results, the interlanguage fossilization reflect on teaching Chinese as a foreign language writing inspiration, guide the Chinese as a foreign language teachers should correct understanding of the interlanguage fossilization of foreign students Chinese writing, the correct understanding deficiency existing in the teaching Chinese as a foreign language writing. Finally from the overall design, formulation, classroom teaching outline, test, evaluation and teaching material write these aspects of teaching Chinese as a foreign language writing strategy idea, try to can reduce the students Chinese writing in interlanguage fossilization. Study of these problems on certain significance to improve students Chinese writing ability, to evade, the learning process of petrochemical in teaching Chinese as a foreign language writing provide certain guiding significance. |