On January 15, the DBP market in Jiangsu region showed a strong upward trend, with a quoted price of 6,950 yuan/ton. In Shandong region, the DBP market also exhibited a strong upward trend, with a quoted price of 6,850 yuan/ton. In Zhejiang region, the DBP market experienced a strong upward trend, with a quoted price of 7,200 yuan/ton. On the same day, the price of n-butanol, a raw material for the plasticizer DBP, fluctuated and rose, while the price of phthalic anhydride increased. The price of isooctanol remained stable with a strong trend. The cost of DBP raw materials rose, while PVC prices fluctuated and remained stable. Downstream demand was weak, and the operating rate of DBP production equipment slightly declined. DBP supply was sufficient, and DBP factory inventories were low. Downstream customers showed moderate purchasing enthusiasm, with transaction prices determined through negotiation. The price range for DBP was 6,850–7,200 yuan/ton. DBP prices showed a strong upward trend, with reduced downward pressure and increased upward momentum, leading to a robust rise in the DBP market.