In order to study the properties of TC4 coatings on TC4 alloys using cold spray technology, two kinds of technical parameters (gas materials and gas temperature) were used to analyze their effects on porosities, hardness and powder utilization ratio of TC4 coatings in this paper. Gas kinds (N₂ and He) and gas temperature (400℃, 500℃ and 600℃) were utlized and were adopted in experiment. The study indicates that the coatings are dense, more harder and utilization ratio is higher when gas temperatures become larger under the same gas materials. The coatings prepared using He are always dense, harder and utilization rate is higher than that of N₂ under the same gas temperature. In the end, the coatings with porosity 0.8%, hardness 440 HV_0.2 (improve 33% than that of TC4 alloys) and utilization ratio 88.2% are obtained under He gas (600℃, 0.9 MPa).