As the kind of plaster and the technology of process were fixed

the influence of water（temperature of water

underground water

distill water.magnetizing water）on properties ofplaster mold has been studied.Experimental results show that when temperature of water is raisedthe flowability of plaster slurry is decreased the gelation time is shortened and the strength an4shrinkage increased with distilled water and magnetizing water

the strength and shrinkage are increased obviously.