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The influence of magnesium to phosphate weight ratios (M/P ratio), water to cement ratio (W/C ratio),magnesium oxide specific surface area on magnesium phosphate cement stone of the early autogenous shrinkage is examined.The hydration products, microstructure of magnesium phosphate cement stone were tested using XRD and SEM methods.The testing show that magnesium phosphate cement stone of the early autogenous shrinkage decreased even expansion with an increase M/P ratio and W/C ratio.However,magnesium phosphate cement stone of the early autogenous shrinkage increased with an increase magnesium oxide specific surface area.With an increase M/P from 5/1 to 3/1, the diffraction peak intensity of MgO in the magnesium phosphate cement stone specimen become weaker, the diffraction peak intensity of MKP become strongger, magnesium phosphate cement stone of the early autogenous shrinkage increase.The SEM demonstrate that the a poor crystal growth can be observed in the cement stone with low M/P ratios, magnesium phosphate cement stone of the early autogenous shrinkage is smaller, while a better crystal growth can be achieved in the cement stone with low M/P ratios, magnesium phosphate cement stone of the early autogenous shrinkage is bigger.