Thickness unevenness has the most common points, shelves, sheet, temperature and so on. Shelves in the compression plastic packaging products when the location of the adjustment is very critical, if there is dislocation or placed unreasonable phenomenon, there will be uneven thickness. And the sheet is related to the sheet in the production process which did not adjust the thickness, so it will lead to such a quality problem. Temperature debugging is also directly related, but also according to different molds of different materials to adjust the level of the corresponding temperature, otherwise there is a non-uniform phenomenon. The solution is to pay attention to the position adjustment of the shelves, the condition of the supplier consultation, the temperature adjusted to the sheet and the fit of the mold.