Abstract: In order to analyze the hydration degree of the cement-lithium slag slurry, the chemically combined water is tested by high-temperature calcination at different ages. The testing results show that the chemically combined water of the cement-lithium slag slurry increases with prolongation of the age that can be able to achieve more than 60% and 80% for 90 d at 3 d and 7 d hydration degree, after then this increase becomes slower. The chemically combined water at 1 d is up to 3 to 4 times under the conditions of high temperature curing, alkali activation, high temperature and alkali activation (composite curing), which is better than standard curing. Relatively speaking, the effect of the 4 kinds of curing is in the order of composite curing >alkali activation> high temperature curing>standard curing. The chemically combined water of unit cement at 1~28 d is small by an equivalent chemically combined water method, the relative index (ψ value) of the cement hydration degree at 1~28 d is greater than 1 when the content of the lithium slag is less than 40%, and ψ value is less than 1 when the content of the lithium slag is 60% under high temperature curing and composite curing. In summary, the hydration degree of the cement and lithium slag can be improved by high temperature curing, alkali-activation and composite curing, and it is more significant in the composite curing period.