Unmanned Airborne Vehicle （UAV） based multispectral remote sensing has the advantages of low cost and flexible time in monitoring small water bodies. However， the common multispectral cameras have the problems of few pixels and lack of characteristic bands of inland water bodies， which limit the advantages of UAV based multispectral remote sensing in monitoring the water environment. In order to solve these problems， this study customized the bands for inland water quality monitoring for the Aerospace ShuWei KP-8 multispectral camera with high pixel， including 670 and 700 nm bands for inland water chlorophyll a retrieval； Then， a flight experiment was carried out to obtain the multispectral image of the turbid and eutrophic Luhun Reservoir. And the synchronously obtained water quality parameters from the water surface experiment were used to build the retrieval models of the typical water quality parameters， including the Secchi-disk depth， turbidity， suspended solids and chlorophyll a concentration； The retrieval models were applied to the multispectral image， and the typical water quality parameters in Luhun Reservoir were retrieved and their spatial distribution rules were analyzed. The results show that the UAV based high pixel multispectral camera has important potential in the operational monitoring of inland water environment.