In order for orthodontic mini-implants to be used as anchorage in orthodontic treatment, stability must be ensured. However, the success rate of mini-implants is reported to be 80-90%, and the clinician may experience disappointment due to unexpected failure during orthodontic treatment. Mini-implant’s design factors such as length, diameter, thread shape, and surface treatment of mini implants can improve the success rate of implants to a certain extent, but they seem to have a limit to show great clinical effect. The most important thing is to place mini-implants accurately in anatomically safe areas where success can be predicted. Anatomically stable sites may be sufficient areas for cortical bone, but alveolar bone characteristics should be evaluated in various environments such as root proximity and soft tissues thickness. Because of the variety of tooth inclination and root curvature of individual teeth, estimating the distance from the root to the site of implantation will be limited by simple 2D evaluation. Therefore, 3D image obtained using dental CBCT is the most accurate method to determine the placement position of mini-implants. If a digital model using an intraoral scanner is used, mini-implants can be placed on the planned site using surgical guide technology. The digital model can also be used for a digital setup to perform goal - oriented orthodontic treatment. Therefore, not only can the accuracy of mini-implant placement be ensured with surgical guide system, but this method can improve the predictability of the treatment result considering the limit of tooth movement in surrounding tooth structures. This lecture introduces the clinical efficacy of goal-oriented treatment plan and implant guided placement method using 3D printer, digital model and CAD / CAM technology.