Abstract: Aming at the monitoring and forecasting of the growth of ocean red tide, an ocean environment monitoring and forecasting technology based on the detecting of the Brillouin scattering echo signal is proposed. This technology can detect the double parameters about the ocean red tide temperature and salinity information. Based on the Brillouin scattering theory, the relationship of the blue-green laser-s Brillouin scattering frequency shift value and energy value with the seawater temperature and salinity is found. Then, the detecting model of the seawater emperature and salinity is established. The blue-green laser-s Brillouin scattering frequency shift value and energy value are evaluated by simulating and calculating, and the temperature and salinity of the seawater at 0~50 m are known. Based on the double-parameter monitoring technology, the growth and decline of the ocean red tide can be monitored and forecasted.