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Dry stock of silica sol ceramic mould was prepared by using of colloidal moulding technique with an optimized vacuum drying process. Effect of roasting process on the shrinkage rate and compressive strength of zircon-silica sol ceramic mould, and the relationship between the roasting temperature and microstructure of zirconsilica sol ceramic mould were studied. The optimum roasting temperature of zircon-silica sol ceramic mould gained by the experiments is 900℃ and the holding time is 2 h. The scanning electron microscope (SEM) observation showed the growth of refractory particles during the roasting process. The occurrence of sintering was observed in the zircon-silica sol ceramic mould when roasting temperature was above 1,000℃.