The technological characteristics of double-gun heating spraying were introduced,and the requirements of double-gun spraying technology on the workability and formulation design of solventless epoxy coatings were studied.The emphasis was on the choice of coating thixotropie system and defoaming system by double-gun heating spraying.The performance parameters of solvent-free epoxy coatings need to match the on-site construction process l0 meet the anti-sagging performance at high temperatures.