Abstract: The quality of translation depends on translators’ understanding of the source language， which is of great importance in the process of translation. Therefore， a study of the factors that affect this understanding is indispensable. This paper discusses these factors in three categories from the translator's point of view to ensure the quality of the translation and improve the quality and level translator：language factors， nonlanguage factors， and cultural factors. Finally we conclud that：translation in the translation process should take into account the above three factors， and continuously improve their own quality and capacity to ensure quality of the translation.