The impact of the moisture on character of laser induced pulverized coal plasma was conducted to determine the influence of moisture on quantitative measurement of coal by laser-induced breakdown spectroscopy. Two samples (Shenhua coal and Pingshuo coal) with close carbon and silicon contents but different water contents were chosen and prepared as received basis and dry basis individually. Calcium atomic spectra lines were used to calculate the plasma temperature at delay time of 83 ns, 500 ns, 917 ns and 1292 ns. C247.856 nm and Si390.5523 nm were chosen to estimate electron density. The results show that the plasma temperature declines as the delay time is prolonged， lower plasma temperature and poorer spectra lines intensity are presented in the samples with moisture，but electron density does not change significantly with different samples.