Abstract: The optimization of the water dissolution process using silver brazing fluxes was conducted by orthogonal test. The test result showed that effect of bake time on flux property is the best notable, next proportioning of compositions affected flux property, then bake temperature affected flux property. The optimum process parameters are component of 42%KF+23%KBF₄+35%B₂O₃, bake time of 45 min and bake temperature of 350℃. By using the silver brazing fluxes, the best results of the jointing can be carried out.