V type slot nozzle in an impact type quick freezer was selected as the research object, and the surface heat transfer characteristics of the freezing area of the freezer were studied, based on different cutting ratio, the ration of distance between the belt and nozzle inlet H to slit width S, Hs. The results showed that the steel surface heat transfer intensity was obvious different along with width of freezer when the Hs<10 and Ψ=0. The steel surface Nu number in X/S=0 was significantly higher than that of X/S=150(The ratio between width direction of quick freezer coordinates and nozzle width S ). With the cutting ratio increasing along the X direction of the strip surface, heat transfer intensity difference gradually decreased, after the cutting critical ratio Ψ₀, the metal surface heat transfer intensity reversed growth, which indicated that the Nu number at X/S=0 was less than that at X/S=150. The cutting critical ratio with the increasing of Hs increased first and then decreased. When Hs>10, the heat transfer coefficient was even in the direction of X, however, the adjusting of the cutting ratio would adversely affect the freezing heat transfer surface area.