The transmission system is the key components of the helicopter. the study and analysis of the dynamics characteristic and virtual simulation have an important function for the whole life cycle in every stage. The 3D model of the helicopter transmission system is established by CATIA software. the load under the typical working condition is calculated. https://www.spidertattooz.com/OPI-GelColor-Magnet-Tool-Mauvnetic-Poles-0-5-oz-p21159/