1, according to the medical history and examination to select the indications, exclude the systemic and local contraindications. For relative contraindications, the implant surgery can be performed after removing the unfavorable factors through treatment. 2. General examination of the whole body: mainly blood test, urine and stool routine if available, which is often referred to as “three routine”, hepatitis B five items, blood clotting time, blood pressure, pulse, ECG, chest X-ray, etc. 3. Oral The oral examination of the patient is the basic examination of the implant clinic, including the oral mucosa, gum condition, the stability of the remaining teeth, the morphology of the remaining alveolar ridge (height, thickness and inversion), jaw position relationship, and oral hygiene. 4. X-ray examination, mainly including local dental film and panoramic film or CBCT examination. 5. Original denture examination, mainly as a reference for the production of implant dentures.