On January 29, the DBP market in Jiangsu region showed an upward trend, with quotations at 8,000 yuan/ton. In Shandong region, the DBP market also rose, with quotations at 7,900 yuan/ton, while in Zhejiang region, DBP prices increased, with quotations at 8,100 yuan/ton. On January 29, the price of n-butanol, a raw material for plasticizer DBP, experienced a fluctuating increase, phthalic anhydride prices remained stable with minor fluctuations, and the price of isooctanol fluctuated upward. The cost of DBP raw materials rose, while PVC prices remained stable with minor fluctuations. Downstream demand remained sluggish, and DBP production equipment operated at a slightly higher capacity, resulting in sufficient DBP supply. DBP factory inventories were low, and downstream customers showed moderate purchasing enthusiasm. Transaction prices were determined through negotiation, with DBP prices ranging from 7,900 to 8,100 yuan/ton. DBP prices increased, with downward pressure weakening and upward momentum strengthening, leading to an overall upward trend in the DBP market.