The double rope timber grab has is equipped with two ropes crane for loading and unloading timber. The characteristic of timber grab is optimum structure, convenient operation, highly loading ratio. This kind of grab is an ideal loading tool that could be used in ports, railway, timber processing, and storage timber units. Using 3D Virtual Design, by Collision and Interference Checking and taking Dynamic Simulation Test, the products can be showed in the stage of design intuitively, which can secure the product’s quality and outward appearance.