The topic of the dissertation is “Difficulty Hierarchy of Chinese Idioms-based on Chinese Materials of Taiwan.” The main goal is to combine theory with application of Chinese teaching and to establish a paradigm of difficulty hierarchy of Chinese idiom to enhance the efficiency of Chinese learning. First of all, according to the data of “Steering Committee of the Test Of Proficiency- Huayu”, we adopted 15 Chinese materials most common used in Taiwan and two authorizd Chinese vocabulary tables. In this way, we picked put 140 Chinese idioms as our research materials. After a series of literature review, we worked out three indications to measure the difficulty hierarchy of Chinese idoms as followings: frequency, semantic transparency and lexicalization. Secondly, to implement these indications, we chose “corpus analysis”, “questionnaire survey” and “structured interview” as thier respective research methods. Furthermore, to weigh three indications, we adopted the concept of “analytic herarchy process” and “Delphi” to analysize their specific proportion. Besides, to avoid the interference of extreme values, we used “Z score” as the methd to examine the data. Thirdly, in the cause of application of Chinese indiom hierarchy, we hope to figure out some practical strategies, including the teaching order of Chinese idiom, Chinese idiom examination, and text books compilation in the near futue. In the end, the paper highlights the actuality and future research direction of compiling Chinese indiom reference books. Lastly, by this way, we hope to enhance international culture communication to empower SLA Chinese idiom learning efficiency.