Abstract: A three-dimensional transient turbulent model of plasma jet on the basis of local thermodynamic equilibrium (LTE) hypothesis was established. The characteristics of plasma distribution and the impact of fields in plasma torch on jet patterns during Ar/H2 plasma spraying using computational fluid dynamics software ANSYS CFX. The simulated results were compared with experiment results observed by a high-speed camera. The results show that simulated jets were obviously fluctuating, which agreed well with experimental results. The plasma distributions in plasma torch and jet region showed clear three-dimensional characteristic. Compared with the temperature distribution, the plasma velocity distribution had stronger three-dimensional characteristics. Both temperature and velocity decreased along axial direction when the plasma jet went into atmosphere. As jet developed, the temperature and velocity started greatly decreasing at the palace about 27.4 mm away from the torch exit, because of the enhancing of cold-air entrainment into plasma and then the increasing exchange of energy and momentum between plasma and cold air. Compared with temperature, the velocity distribution was more easily influenced by air.