There is a great difference existing in TCM therapies and curative effect. The guideline of evidence-based clinical practice can normalize medical behaviors, shrink the difference during therapeutic course, spread TCM technology of diagnosis and treatment and promote TCM toward the outside world. The paper chose 13 evidence-grading systems with international impact, investigated the evolution of current evidence-grading systems, analysed the present situation and characteristics of TCM evidence-grading system, and compared the evidence difference between TCM and modern medicine. The author concluded that Western medicine and TCM are different medical practical modes and TCM has properties of both humanities and nature sciences. Singular methodology dose not fit in with the characteristics of TCM sciences when TCM clinical evidences are graded and evaluated, so the methodology combining classic quantitative study, correlation analysis and qualitative method of sociology should be considered.%中医治疗手段及疗效存在巨大差异,基于证据的循证临床实践指南可以规范医疗行为,缩小诊疗过程中的差异,推广中医诊疗技术,促进中医药走向世界.纳入国际上较有影响力的13个证据分级体系,梳理现行证据体系的演进过程,并分析中医证据分级体系现状及特点,比较中医和现代医学证据的差异,认为西医和中医属于两种不同医疗实践模式,中医学兼具人文和自然学科的双重特点,所以在对中医临床证据进行分级和评价时,采用单一方法显然不符合中医学学科特点,应考虑经典的定量研究和关联分析与社会学的定性研究方法等多种研究方法相结合的方法学.
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