Ceramic precursor plays an important role in preparing ceramic matrix composites through PIP （Precursor Infiltration and Pyrolysis） method. The properties of precursors have decisive influence on manufacturing process and properties of the composites. A new liquid ceramic precursor VHPCS and its ceramic products were investigated by infrared spectrometry

differential scanning calorimetry

thermal gravimetric analysis and X-ray diffraction. Also

the curing and pyrolysis behavior of VHPCS had been discussed. Results showed that VHPCS contained both Si-H and Si-CH=CH2 reactive groups

and it could be cured above 165℃ . The ceramic yield of VHPCS at 1000℃ in nitrogen atmosphere was 60% and the pyrolysed products showed well crystal-structure stability in the temperature range of 1000-1300℃ . Results showed that VHPCS could be a promising precursor for PIP method.