Antistatic coating of aircraft fuel tank is soaked in solution of diethylene glycol methyl ether (DiEGME) to examine the physical and antistatic properties changes of the coating in different proportion such as color, pencil hardness, adhesive force, impact strength, flexibility and surface resistance of the coating tested with different methods, and the FTIR, SEM and EDS are also used to check the molecular structure, surface morphology and element composition of the coating. The results show that with the increase of DiEGME concentration, the mechanical and the electrostatic properties of the coating are on the decrease to a different extent at experiment period. When the concentration of the DiEGME in the water reaches to 20%, the electrostatic conductivity property of the coating is failed, and when the concentration is to 60%, the mechanical property is failed too. When the concentration of the DiEGME in the NO.3 Jet Fuel reaches to 0.4%, the electrostatic conductivity property of the coating is failed, and when the concentration is to 0.6%, the mechanical property is failed too. It is the conclusion that the DiEGME has a poor effect on the mechanical and electrostatic conductivity properties under a certain condition and even makes the coating peeled off under special condition.