The NiCrFeAl/h-BN.SiO₂ abradable sealing coatings were prepared by METCO 6P-Ⅱ flame spraying. With the addition of SiO₂, the abradability of the NiCrFeAl/h-BN coatings are improved. The anti-erosion performance of the abradable sealing coatings prepared with different flow-ratios of oxygen and acetylene (oxygen-acetylene ratio) were researched. The results show that the h-BN and SiO₂ particles are coated by NiCrFeAl during the spraying process. The metal phase adequately melted with the increase of oxygen-acetylene ratio, and the distribution of h-BN and SiO₂ are more homogenous. The Rockwell superficial hardness was raised from 50.8 HR15Y to 70.3 HR15Y, and the bonding strength was improved. The morphology of the wear tracks was characterized by adhesive wear and abrasive wear, and the roughness decreases with the increasing oxygen-acetylene ratio. The cohesive force of the coating was promoted deriving from the nonmetallic phase was coated by metal phase almost fully. The weight loss rate of the coatings decreases, and the anti-erosion performance are improved.