Chromium carbide coatings are widely used on gas and steam turbine components in order to protect the components from high temperature wear-corrosion and erosion. Detonation gun spray technique (D-gun) was utilized to fabricate the 65Cr₃C₂-35NiCr coating on martensitic steel. The effect of explosive charge on the coating performance was then investigated. Microstructural characterizations carried out by scanning electron microscopy (SEM) indicated that denser and higher adhesive 65Cr₃C₂-35NiCr coating were obtained under a certain explosive charge, while a higher explosive charge resulted in the dissolution of Cr₃C₂ in NiCr phase and formation of numerous of micro cracks inside the coating, which presented a great threat to the mechanical property of the coating. The corresponding mechanisms were then discussed.