Abstract: Objective To investigate and measure anterior mandibular jaw bone for clinical application using cone beam computed tomography (CBCT). Methods Fifty Han-Chinese adults were selected in this study between Jan. 2011 and Jan. 2013. All CBCT of the 50 adults were reconstructed to evaluate and measure shape, bucca-lingual width and mesial and distal distance at alveolar crest of anterior region of mandible. Result Buccal shape of anterior mandible was concave in all cases and the most concave point was located on the upper and middle one third of mandible mostly. Shape of lingual was diversified, and convex took a high percentage. For the bucca-lingual width, middle and lower margin of anterior mandibular jaw bone were wider than that of alveolar crest and apex of tooth. Mesial and distal distance at alveolar crest of anterior mandible were between 4.46mm and 6.94 mm, canine had maximum distance, lateral incisor had the second and central incisor had minimum distance. Conclusion When implanting in mandibular anterior alveolar, especially single central incisor or lateral incisor missing, implant may not achieve enough space and adjacent teeth were easy to be affected. Take care of shape of mandible to avoid buccal and lingual penetrating when doing implant surgery in anterior mandible. It was suggested that CBCT should be a routine examination before implant surgery.