This study aims to describe Kerincinese interference on the narrative text written by students through its kinds, grammars, and it cause. This study refers to siregar’s (2011) statement that had introduced the term of ‘linguistik interference’ on bilingualism indication that showed the contravention of linguistic norm as the effect of language contact. This study is qualitative study with descriptive method. The data was sentences contained of Kerincinese interference in narrative text written by students of SMA 3 Sungai Penuh. the source of data was 50 students selected from X by purposive sampling thecnique. The data collected by using observational technique, tapping technique and continued with taking note technique. The data gathered were identified and classified. In order to guarantee the originality of the data, the writer used constancy observational observational and discussion techniques. With the native of Kerincinese at school and at the neighborhood. The data that had been classified and identified then were interpreted and analyzed to get conclusion. The result of study showed the following points. First of all, the writer found the interference of Kerincinese in the narrative text were from all language levels. The levels that been found were in sintax, semantics, morphology and phonology levels. The reason of the dominacy dued to the high frequency of usingin daily communication. Secondly, proactive and syistemic interferences were the kinds of interferences that were found in the text. Thirdly, the cause of the interferences of Kerincinese into Indonesian language are the over comparation, the structure transfer of Kerincinese into Indonesian language, the vocabulary lacks and the influence of Kerincinese as an interlanguage becase the students are more master the Kerincinese than the Indonesian language itself. As conclusion based on study, the writer found that the interference in the narrative text written by the students SMA 3 Sungai Penuh became in all language levels. Keys word: interference, bilingualism, level language.