There are many necessary examinations that need to be done before formal orthodontic treatment, which are briefly introduced below. First, the orthodontic specialist should do a comprehensive examination of the patient’s intraoral and extraoral conditions. Secondly, patients need to take X-ray films, including lateral cephalometric films and full-mouth surface tomography films, and individual patients also need to take dental apical films. The physician needs to judge whether the patient’s teeth are healthy and suitable for orthodontic treatment based on these materials. It is also an important basis for diagnostic design. Wu Guanying, Oral Medicine Center of China-Japan Friendship Hospital Third, blood tests (usually including hepatitis B, hepatitis C, HIV antigen, etc.) are needed to eliminate cross-infection between patients. Fourth, a study model needs to be taken. The physician analyzes the severity of the patient’s malocclusion through model measurements, and this is an important piece of information for diagnostic design. Fifth, digital camera photos need to be taken, including facial photos and dental photos. This item is also an important information for the diagnosis design. A regular orthodontic specialist needs the above information to make an accurate and well-designed plan for the patient. The design plan is the prerequisite for the success of orthodontic treatment. Only if the treatment goal is clear and the treatment plan is reasonable and feasible, can we achieve good treatment results. We wish every patient can get the best quality orthodontic treatment and achieve the best treatment effect.