The influences of additive SiO2 in the plasma sprayed ceramic coatings and subsequent laser remelting have been investigated in this paper. The liquid-sintering effect of SiO2 is considerably obvious in the ceramic coating ZrO2of a high melting point, while this effect is not apparent in Al2O3 coating possessing a relatively low melting point. During laser remelting, the additive SiO2 can not only reduce the cooling stress of the remelted layer in ZrO2coating, but also hinder the spreading of cracks. While in Al2O3 coating, in addition to the above effects, SiO2 can further make the grain-size distribution more uniform and form a continuous glass-like matter around the grain boundaries, thus the formation and spreading of cracks will be suppressed. As to TiO2, during laser remelting, it will react with Al2O3 transforming into TiAl2O5 that possesses a large anisotropic coefficient of expansion, thus it will lead to a big and asymmetrical stress and finally some cracks occur in the remelted layer.