The synergistic use of calcium carbonate filled masterbatch and new functional masterbatch is an efficient combination solution for achieving "cost reduction and efficiency improvement+performance upgrade" in plastic processing. Through the complementary effect of the two, it can not only reduce raw material costs, but also endow products with special properties, meeting higher usage requirements. In terms of synergetic mechanism, the core role of calcium carbonate filling master batch is to reduce costs and improve rigidity, while functional master batch focuses on giving products special properties such as anti-aging, antibacterial, anti-static, toughening, etc. When used together, the two can make up for the decline in toughness that calcium carbonate filling may bring or further strengthen the specific properties of products on the basis of ensuring the rigidity and cost advantages of products. For example, in the production of pipes, adding calcium carbonate filling masterbatch can reduce the cost of raw materials and improve the rigidity and pressure resistance of pipes. If the anti UV function masterbatch is used at the same time, it can give the pipes anti-aging performance and is suitable for outdoor laying; When producing automotive interior parts through injection molding, calcium carbonate filled masterbatch reduces costs, and when combined with toughening and antibacterial functional masterbatch, it can enhance the impact resistance and environmental safety of the interior parts; When producing plastic drums through blow molding, calcium carbonate filled masterbatch improves the rigidity and dimensional stability of the product, and when combined with flame-retardant functional masterbatch, the plastic drums can meet the flame-retardant requirements of hazardous material packaging. When using, it is necessary to adjust the addition ratio of the two reasonably to ensure performance balance: the addition ratio of calcium carbonate filled masterbatch is determined according to cost reduction and rigidity requirements, while the functional masterbatch is adjusted according to special performance requirements. Generally, the total addition ratio of the two does not exceed 60% to avoid affecting the basic mechanical properties of the product. In addition, when using synergistically, attention should be paid to the compatibility between additives, and products with good dispersibility and stable formula should be selected to avoid problems such as agglomeration and delamination. This collaborative solution is widely applicable to various processes such as injection molding, blow molding, roll pressing, and pipe materials, especially for high-end plastic products that require both cost and performance, such as automotive parts, outdoor building materials, food packaging, electronic casings, etc., providing enterprises with a dual advantage of cost and quality in fierce market competition.