We used two kinds of industrial waste of Fly ash and blast furnace slag as major raw materials, and modules of sodium silicate ranging from 1.2 to 1.8 as the activator to manufacture geopolymer. We conducted the orthogonal experiment in five-factor and four-level form, and studied water to binder ratio (W), alkali-activator proportion (S), blast furnace slag replacement ratio (B) and the module of sodium silicate (M) on the four essential properties including the fluidity, setting time, compressive strength and tensile bond strength of the geopolymer used in green materials for construction mending. The relation between mix design and performance index of the green repair material were investigated by range analysis and factor analysis. By synthetic analysis, an excellent geopolymer-based green material for construction mending could be manufactured when W, S, B and M were 0.28, 0.14, 0.4, 1.2, respectively.