The so-called masterbatch is the aggregate made by uniformly loading the super-constant pigment (dye) material in the resin. In order to maintain the excellent performance of the fiber, the most suitable carrier material should be polyester itself, but because of the high melting point of polyester. Low hygroscopicity, poor dispersibility of pigments, and low adsorption of colorants, etc., polyester as a carrier is limited. Coupled with the sensitivity of polyester to moisture, moisture can cause polymer degradation during the production of masterbatch, and change the viscosity of the melt. Therefore, most color masterbatches still use other polymers as carrier materials. In order to prepare high-quality polyester masterbatch, some people pulverized polyester chips to increase their specific surface area to increase their dye adsorption capacity. The polyester used as the carrier of the masterbatch should preferably be a bright chip without any additives. The lower the ash content, the better, and the less gel particles the better. The degree of chip pulverization should be selected at an appropriate cost-performance ratio according to needs.