Emission spectroscopy was used to analyze the plasma spray physical vapor deposition (PS-PVD) jet of different gas compositions and Abel inversion was used to calculate the spectral intensity of radial point to get the gas distributions of different gases. Multispectral line slope method was used to study the impact of radial distance and gas composition on electronic temperature. Radial distribution of electronic density was calculated by stark broadening. The results showed that: in Ar/H2 gas, H2 was well-distributed in the 0-30mm area and increased with radial distance in the 30~60 mm area; After adding He gas, the concentrations of Ar and H2 were low at the centre of jet and increased with radial distance, and He gathered at the centre of plasma jet; Electronic temperature and density decreased with the increase of radial distance, at the same time, influenced by H2 and He.