The high-temperature sintering and ball milling were adopted to prepare SiO2 glass and Cr2O3 ceramic composite powder. The glass-ceramic coating was prepared by using the high-velocity flame spraying on the surface of 45 steel. And laser micro-joining techniques were used as secondary treatment in order to improve its properties. Effect of laser micro-joining on microstructure and properties of glass-ceramic coatings were investigated. The results showed that the laser micro-joining method being taken as the secondary treatment, the compactness of the coating is improved and the coatings becom...