Key points of analysis: the price on February 8 fell by 1.35% compared with the previous trading day. The market of raw material phthalic anhydride is stagnant, the price of phthalic anhydride fluctuates and stabilizes, the price of isooctanol fluctuates and falls, and the cost of DOP raw material decreases; The PVC market fell, the demand for plasticizers was weak, and the downward pressure on DOP was increased.

　　Aftermarket forecast: the demand for lower costs is weak, and the price of DOP is expected to fall in shock.