Objective To provide theoretical basic for clinical judge of bone healing and to determine the removing time of the outer fixator by comparing the healing speed of transverse fracture with that of oblique fracture in the same locality under the same condition. Method Using three-dimensional limited elementary analytic method to analyze the maximum stress values, the maximum shifting quantity and the maximum quantity between the two far endings of extremities in the middle of the skeleton under the same condition as the callus with the same mechanical function filling up the both endings when placing the same loads on the perpendicular axis, transverse axis and the sagittal axis, and to compare the differences between the two kinds of fractures-transverse fracture and oblique fracture. Result At the far ends of the extremities under various kinds of loans, the stress and shifting shows little difference in the same surface for the transverse fracture. To make it broken, the loads need to reach fairly high value. For the oblique fracture, the stress and shifting appeared on them are rather distinctive because the two endings of the fracture were not in the same surface. The near end received more power and appeared less shifting while the far end received less power but larger shifting. Only bythe less loads could make it broken .The near end would become broken first, and affected the whole fracture line because of the dense of stress, then caused afresh fracture. Pressure or extension placed upon the perpendicular axis induced less shifting on the far end of the extremities while pressure placed upon the horizontal axis and the sagittal axis could cause larger shifting even though with the less pressure. Conclusion In the same locality and under the same condition of mechanical function, the transverse fracture could be concrescence faster than that of the oblique fracture.