To study the effects of Ni element addition and heat treatment on the microstructure, phase composition and mechanical properties of cold spraying Al-Ni sediment. Al and Al-25%Ni (hereinafter referred to as AlNi25) deposition were prepared by cold spraying technology in advance, and then the prepared deposition was put into a tubular heating furnace with argon atmosphere for heat treatment. Optical microscope, scanning electron microscope, microhardness tester, X-ray diffractometer and universal tensile testing machine were used to test and analyze the microstructure, phase composition and mechanical properties of the sample. The phase of AlNi25 deposition after heat treatment is mainly Al and Al3Ni. The porosity of the AlNi25 deposit increased from 1.4% in the spray state to 2.5% in the heat treatment state due to the kekendall effect induced by the heat treatment. The hardness of sprayed Al deposition is 44.2HV0.2. After 500 ℃ heat treatment, due to the recovery and recrystallization, the hardness value drops to 26.72HV0.2. The hardness of the sprayed AlNi25 deposition is 49.2HV0.2. After the heat treatment, the strengthening effect of the generated Al3Ni intermetallic compounds on the deposit is equivalent to the softening effect of the heat treatment, resulting in the hardness of the final heat-treated AlNi25 deposit is 50.5HV0.2, which is slightly different from the sprayed AlNi25 deposition. After heat treatment, the original interface between particles in the deposited body disappears, and the tensile strength of Al deposition and AlNi25 deposition body in heat treatment state is 64.7 MPa and 107 MPa respectively. At the same time, the plastic deformation capacity of the two types of sedimentary bodies was effectively improved. Before heat treatment, the two types of sedimentary bodies had no plasticity. After heat treatment, the plasticity of Al sedimentary body and AlNi25 sedimentary body was effectively improved, and the plastic strain was 3.7% and 0.97% respectively. Al3Ni intermetallic compounds were generated in situ by heat treatment of cold spraying AlNi25 deposition, which effectively improved the hardness, tensile strength and plastic deformation capacity of the deposition.