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Abstract. In this paper, the catalyst PTA@MIL-101-NH 2 -Cl with various 2, 5-dichloroterephthalic acid was synthesized. Based on this, the effect of the strong negative groups -Cl on the crystal structure, molecular structure and thermal stability of the catalyst was studied. It was found that the immobilization of -Cl did not affect the structure of the catalyst, and it can improve the thermal stability of the catalyst to a certain extent. The mechanism of -Cl as the cellulose adsorption center in the directional hydrolysis of cellulose were analyzed. The strong negative groups -Cl form hydrogen bonds with the hydroxyl of cellulose to selectively adsorb cellulose, weaken the molecular hydrogen bonds of cellulose molecules to reduce the difficulty of cellulose hydrolysis and improve its hydrolysis efficiency. The yield of glucose obtained by the hydrolysis of cellulose after grafting-Cl catalyst was 81% higher than that without -Cl.