Analysis：The Chinese phthalic anhydride market was weak. The negotiation price was low. The downstream demand was flat. The sales condition was still weak, and the naphthalene products prices decreased. Under the low price, many low-priced phthalic anhydride saw in the market. However, as the supply was not high, the phthalic anhydride market fluctuated marginally. In the future, the demand will be limited. Near the Spring Festival, the players will begin to stock goods. It is predicted that will be warm gradually after decreasing. The reference price of phthalic anhydride was $1,030/mt.