BACKGROUND:: The structure of Beagle's mandible is complex, and improper place for microscrew implantation would lead to deficiency of bone mass surrounding the microscrew and microscrew loosening. OBJECTIVE:: To study the anatomic structure of Beagle's mandible and find out the place suitable for placing the orthodontic microscrew. METHODS:: Five male Beagles corpses were collected. The distance between P2 and M1, the distance between tooth root crotch and inferior maxillary nerve, the degree of tooth root crotch, the mesiodistal width between the roots of teeth and the buccolingual sickness from 4 mm and 6 mm beneath the top of alveolar crests were measured through the use of sliding caliper. RESULTS AND CONCLUSION:: The mean distance between P2 and M1 was 52.70 mm.The root crotch of M1 was the farthest place from inferior maxillary nerve, while the root crotch of P4 expressed the nearest. The degree of M1 root crotch was the biggest while P4 showed the smallest. The mesiodistal width between the roots of teeth 4 mm and 6 mm beneath the top of the alveolar crests all exceeded 5 mm and the buccolingual sickness increased. From 4 mm and 6 mm beneath the top of the alveolar crest, the mandibular interradicular place for microscrew implantation in Beagles was located between the mesial and distal roots of P2, P3, P4 and M1.Liu W, Hu Y, Deng F, Song JL, Zheng LL, Zhao ZH, Tang T, Wang ZQ. Mandibular interradicular place of beagles for microscrew implantation. Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu. 2011;15(41): 7635-7638.[http://www.crter.cn http://en.zglckf.com](Figure is included in full-text article.)