Objective：To improve that traditional implants could hardly replace those nature-form teeth. Methods：By scanning standard model teeth，the three-dimensional finite element models of first molar teeth were established，and the vertical，horizontal and oblique three-dimensional instantaneous loads were applied to the model to obtain stress distribution and maximum stress of the tooth，mucosa，cortical bone and cancellous bone. Results：There is no significant difference of maximal stress between the first maxillary molar and first mandibular molar，but it is quite different from traditional cylindrical threaded implants. Conclusion：This result suggests that the implant with single form is difficult to meet the functional needs of different teeth，especially molar teeth，and future implant morphology can be expected similar to the natural tooth shape.