The"special team for eliminating yellow flow defects"was set up,the effects of multi-layer structural plate seams,hinge flatness and chamfering angle,hinge connecting axle cavities,and welding and gluing at the press-fit edge position on the yellow flow of the X model were determined.Combined with practical examples to highlight the effects of locking the yellow flow on the X model.the methods to solve the yellow flow defects were found through the optimization of gluing process and the development of gimbaled blowing device.