Dental implant is a new method that helps restore the strength of those who have lost their teeth for any reason. Despite the advances in dental science, due to the novelty of the dental implant method, there is a great need for extensive research in this field and comprehensive research should be done on the various variables in implant design to increase the likelihood of successful bone grafting. This Help dentist to choose the model and implant plan needed for a patient with more comfortable. This thesis is focused on the effect of pitch, conical angle of the body, geometry of the fixture. The dimensions of the trapezoidal thread are investigated in order to obtain its effect on the biomechanical characteristics of bone tissue. A reference is selected for an instance, then in each group we changed only one parameter of the original reference. Therefore, using Finite Element Method, the effect of each parameter with chewing load (in the area of the first molar of the mandible) was investigated separately. Finally, we chose the superiority of the original model. Also, the best example presented in this article was compared with a new form of dental implant. Instead of using a thread, a double-thread is used in its body. The results obtained from twenty-one implant models simulated in this study. Comparing the results with the biomechanical responses of the jawbone, recommend the use of double-thread implant screws for the model. Keywords: Dental Implant, Finite Element Method, Thread pitch, Body Angle, Double-thread, Chewing Forces