Using air cooling instead of water cooling for compressor turbine exhaust is a good choice for the chemical plants in areas lack of water, but there are some problems that cannot be ignored in the operation of air cooling system. By introducing the air cooling system of turbine exhaust of cracking gas compressor, ethylene refrigeration compressor and propylene refrigeration compressor in the ethylene plant of a petrochemical company, the problems in high temperature operation in summer are studied, and some feasible solutions are given to ensure their normal and smooth operation.