Because of the shortage of petroleum in the environment recently, we are looking for renewable resources to replace petroleum. The wind energy was started to pay attention. However, the main material for wind turbine blade generator is FRP (Fiber Reinforced Plastics). Therefore, the rich FRP yacht building experience make the Taiwan yacht industry suitably get involved in the process to manufacture the blades. One or two shear webs are used as a reinforced structure between the double-bladed spar caps. However, the complex section structure makes shear webs and spar caps be manufactured separately. The glue part is the weakest part and also the stress concentration part so that it is easy to delaminate. How to design the best geometry shape is what we are going to discuss. In this paper, three bonding methods (I series, L series, and T series) are designed in accordance with the common stiffener for wind turbine blade. Placed in clamping apparatus, the three series are put under external force to observe the different destruction process when shear web and spar cap are bonded with different methods. Then, based on the experiment result, we can compare with the numerical simulation manner to prove that the simulation munner is correct. The numerical simulation is analysed with ABAQUS. Analysing the bonding points with cohesive element, which is specially used for simulating the problems of the interface between two objects, can help to understand the damage process when shear web and spar cap are bonded. In conclusion, we simulate by the finite element software and then prove by the experimental results. In the future, we will except that the best solution for geometry shape can be provided to support yacht industry when manufacturing the blades.