Wood I-joists is a kind of wood-based engineering material which was widely used in wood construction. As it is in fact, the property of I-joists are influenced not only by normal stress but also by a part of shear stress when they are taking into application. In this study, the effects of different factors were evaluated on the tensile property of the wood I-joists. The factors include the depth of the tanks on the flanges, the length of joint and different kinds of flanges. The method of control test was used in the process of the experiment design, and tensile shear test were taken during the experiment at the aim of testing the bonding property of the I-joists using a universal mechanical testing machine. Ultimately, it has been discovered that the factor of depth of the tanks and the length of the joint influence the bonding property mostly. So this paper offers the optimal fabrication technology of the I-joists to make it is possible for the increase of reliability when wood I-joists are taken into application.