Abstract: In order to study on the influence of the properties of alkali-activated slag cementitious materials with different activator types, using blast furnace slag as cementing material, sodium hydroxide solution and sodium silicate solution as exciting agent, and sodium carbonate solution in water/cement ratio is 0.3, equivalent to 4% of the alkali conditions, three kinds of exciting agent excitation effects on slag cement materials were studied, and the microstructure and hydration products of alkali slag cement materials were analyzed by microscopic test means.The results showed that different initiators had different effects on the properties of the cementitious materials. Specifically, the setting time of sodium carbonate as the initiator was the longest, which was much longer than that of sodium hydroxide and sodium silicate as the initiator.When sodium silicate is used as an activator, it can obtain higher strength, but its shrinkage rate is the highest.As an initiator, the cementitious material prepared by sodium hydroxide had higher strength in the early stage, but the later stage of strength development is slow. Microanalysis shows that when sodium silicate and sodium hydroxide are used as the initiator, the hydration products are mainly C-S-H gel and CaCO₃, while when sodium carbonate is used as the initiator, the hydration products are mainly CaCO₃.