Most RCT study patients usually require a single disease, the use of standard treatment and a single intervention to evaluate interventions in an ideal state can achieve maximum effect,that is theoretical effect, it is difficult to provide the evidence of practical clinical efficacy or effectiveness. Secondly, RCT often require strict inclusion and exclusion criteria, resulting in inadequate representation of the study, thus limiting its conclusions spread to overall. There are some challenges for different treatment methods on the actual effect of the patients in the evaluation of conventional medical practice with RCT.