is to evaluate the effect of radiant heat by blue light diode laser (445 nm) wavelength on surface hardness of two self-cured glass ionomers and using scanning electron microscope for surface morphology for tested materials. Materials: Two groups of conventional GICs were divided into (Equia IX Forte, Medifil forte IX), both triturated for 10 seconds by amalgamator then packed into Teflon mold (5 mm x2mm) In G1: control group specimens, 1.5 minutes time to 2.5 minutes till complete setting. G2: specimens were laser treated during setting time for 60 seconds. Diode laser tip was placed 1mm over GIC mold until complete set. All discs are tested for Vickers hardness number. All specimens were Scanned by SEM magn. 3000x on various surface areas to detect any alterations following conventional treatment and laser treatment. Surface hardness data of glass ionomer specimens were statistically analyzed using two-way ANOVA to detect the effect of type of glass ionomer and the use of laser on VHN. Yet, there was no interaction between the two tested variables. laser had the same effect on the two tested groups. Conclusion: Radiant heat produced from blue diode laser (445nm) increased VHN and affected surface morphology of both tested GICs.