Abstract: The behavior of shock compression of the mixture of carbon and water is studied by means of loading technique of two stage light gas gun. It is found that the behavior in the mixture of graphite and water is different to the mixture of diamond and water below shock loading pressure of 19 GPa; as shock pressure is greater than 23 GPa, their compression Hugoniot is close, it shows that the more graphite has transited to diamond. The shock Hugoniot at 52.9 GPa shock pressure in the mixture of graphite and water is different abnormally, i.e. when the pressure rises, the volume expands, it related to produced gas because the carbon reacts with water under high pressure. The emission spectra above mentioned mixtures are observed by means of OMA spectrometer. The results show that the emission spectra on the obvious head radiation in the range from 350 nm to 750 nm as shock pressure is larger than 16.4 GPa. The spectrum bands of C2, CO, CO2 are obvious, when shock pressure is larger than 34 GPa, it shows that the carbon reacts with water. The choices of interaction potential and mixing law for the mixture of carbon and water are discussed.