A severe harmful Algae Bloom (HAB) hit Hong Kong and its adjacent areas in 1998, causing more than 300M HK$ lost and social chaos. The main concern was: will the event happen again? When? Several steps have been taken towards this question" What should we do after the event". HK government has organized an expert committee to study necessity and possibility to set up a program of "red tide monitoring and management in Hong Kong". And the AFD(Agriculture and fisheries Department) and EPD(Environmental Protection Department) in Hong Kong has strengthened routine monitoring activities around HK waters. The academic community in HK also actively participated to answer the question. Three projects, sponsored by different source, every one focused on HAB related issues, were integrated and launched investigations in 1999. The subjects in the integrated projects were 1. Dynamics of nutrients in HK and adjacent seas. 2. Mechanism of eutrophication and its relation to HAB in HK. 3. Understanding of limiting/promoting factors to local HAB species. 4. Competition of "native" species with invaded species in forming HAB in this area. 5. Development of 3-D monitoring system and early warning model for HAB alert/ alarm signal. Preliminary results showed that 1. It is difficult to solely use satellite images for HAB study in this area because of the weather (>90% clouded), additional data processing may help t o improve the output. 2. Some kind of correlation seems to existed between El-nino and HAB events in this area. 3. Potential for two local species to form HAB in this area were found after series of environmental condition experiment. 4. It revealed that meteorological conditions may pay an important role in providing nutrients in forming HAB if the wind direction is "correct" and strong enough to remove the surface water in a specific area to form "small scale upwelling".