Evidence-based health care involves the systematic collection, synthesis and application of scientific evidence to guide clinical practice and policy-making. Systematic reviews are a key component of evidence-based health care. Currently, CDSR has included 58 systematic reviews of CHM. Almost seventy percent of included reviews' topics were too broad, the percentage was much higher than that of similar reviews published in Chinese journals, which was 38 percent (41 among 107 reviews) [69] . It is difficult to develop a comprehensive search strategy for broadly focused reviews, for instance, one hundred and sixty herbal medicines are now available for coronary heart diseases treatment, a systematic review of CHM for coronary heart disease will have to include clinical trials of all these herbal medicines, it is easily to cause the incomplete identification of relevant studies. Choosing broad topics for reviews will require more resources in data collection and analysis, the results may also be too complicated to interpret. So topic selection of CHM reviews should focus on specific clinical problems, the extensive titles are not recommended.