The influence of glycol, the main composition of the most frequently used aircraft dicer, on the freezethaw durability of high performance concrete (HPC ) is investigated. Freezethaw durability of HPC is tested by accelerated freez e thaw test. Four kinds of the solution, i.e., tap water, 35％ NaCl solution, glyc ol solutions, and a LBRA type commercial aircraft deicer are employed. Results s how that freezethaw durability of HPC exposed to glycol solutions is closely related to the solution concentrations. The failure of HPC exposed to 35％ gl ycol solution is similar to that of those exposed to 35％ NaCl solution, i.e., serious surface scaling. While the damage of HPC exposed to 125％—2 5％ glycol solutions is postponed. Compared with glycol solution, the commercia l aircraft deicer has much more negative effects on HPC freezethaw durability compared with 35％ NaCl solution. In t he presence of com mercial aircraft deicer for HPC subjected to freezethaw cycles, the deteriora tion is mainly due to scaling and spalling.