On February 3, the price trend of phthalic anhydride in East China was weak and consolidating. In the market, the mainstream quotation for phthalic anhydride produced by the ortho-xylene method was 6,000–6,200 yuan/ton, while the market price for phthalic anhydride produced by the naphthalene method ranged from 5,550 to 5,900 yuan/ton. The price of industrial naphthalene fluctuated and declined, while the price of ortho-xylene remained stable, leading to a decrease in the cost of phthalic anhydride. Downstream, the plasticizer market experienced fluctuating declines, with plasticizer manufacturers operating at low and stable equipment utilization rates. Downstream demand was primarily driven by rigid procurement, and phthalic anhydride purchases were mainly based on demand, resulting in weakened support for phthalic anhydride demand. Phthalic anhydride manufacturers maintained stable equipment utilization rates, ensuring ample supply. Phthalic anhydride inventory remained at low levels. It is expected that the future market for phthalic anhydride will continue to show weak consolidation.