Randomized controlled studies (RCTs) provide evidence-based medical evidence with the highest level of evidence for clinical practice and are the gold standard for evaluating new treatments and new technology operations. It is the requirement of a competent clinician to be familiar with the principles and methods of RCT, interpret the results of clinical trials correctly and apply them reasonably to clinical practice. Doctors with rich practical experience and good thinking and exploration can ask research questions of important clinical value, design and complete high-quality RCTs to answer these questions, thus promoting the update of guidelines and the development of diagnosis and treatment technologies.