To provide a nacelle roof structure of a wind turbine generator, where the nacelle roof structure is capable of reducing stress concentration on joints of a roofing member divided into multiple parts to accommodate growing size of a nacelle as well as improving transport efficiency of the roofing member. The final drive assembly including a first and a second reduction gear assembly. The conduction strip is partially disposed in the insulation strip and partially exposed out of the insulation strip via the opening. 1%-10 wt % tackifier is mixed with anti-freezing agent, in which 0.