On February 10, the market price of phthalic anhydride in Jiangsu region fluctuated and declined. The mainstream negotiation price for ortho-xylene-based products ranged from 6,000 to 6,200 yuan/ton, while the mainstream negotiation price for naphthalene-based products ranged from 5,550 to 5,900 yuan/ton. The equipment operation of phthalic anhydride manufacturers remained stable, with the operating rate trending low but steady. The domestic phthalic anhydride market had ample spot supply. The price of raw material ortho-xylene stabilized, while the price of industrial naphthalene fluctuated and declined, weakening the cost support for phthalic anhydride. The plasticizer market, a downstream sector, also experienced fluctuating declines, with plasticizer enterprises maintaining stable operating loads, further reducing demand support for phthalic anhydride. Downstream industries adopted a rigid demand procurement approach. In the later period, the phthalic anhydride market is expected to experience weak consolidation.