With the increasing number of systematic reviews

researchers can make more use of the secondary research results to comprehensively evaluate the current status of evidence in a certain intervention or disease field. Therefore

the research type of overviews of systematic review has emerged. Through a comprehensive understanding of the current situation of overviews in the field of traditional Chinese medicine（TCM）

the current deficiencies in this field have been discovered. The author refered to the latest Cochrane Handbook to introduce the production method of overviews

briefly outlined the steps of overviews

and focused on the difference of the crucial procedure in the topic selection

inclusion and exclusion criteria

research quality evaluation methods

data analysis and the quality of evidence between overviews and systematic review. Meanwhile

the method of data analysis was discussed according to the different research purposes

including the reproduction of the original system evaluation results

the classification and sorting of the original system evaluation results

and the new meta-analysis

indirect comparison and network Meta-analysis according to the new research purpose. The method to deal with duplicate documents in the included systematic reviews was introduced

in order to provide a basis for researchers to choose appropriate research methods to carry out overviews.