Over the past few years, it became more obvious that students with low level of English language competence increasingly appeared from elementary schools to colleges and universities. Different types of errors in interlanguage made a deep impact on communicative competence. In regarding to the causes which resulted in such errors, the internal parts of learners were the main factors. Therefore, it is needed to investigate the internal influencing factors on communication very thoroughly. We use the method by documents researching to figure out the backgrounds of errors in English language. Errors in language learning and use will be collected and analyzed. On the basis of the analysis and discussion, it is hoped that the influencing factors will determine which areas in the learner's communicative competence need more attention.