we study the differences between planet gear transmission with buoyant components and planet gear transmission without buoyant components get two kinds of even load condition by measuring and comparing the values of the bending deformation on each shaft of the planet gears; conduct the frequency analysis of the dynamic olad fluctuation curves of the planet gears through FT. Finally
we can find the affect levels of all kind errors for the even load of the planet gears. This analysis is helpfule for designing and manufacturing the planet gears.