Suspended sediments not only influence water quality,but also play an important role in coastline evolution．With the aid of sensors on board buoy，plane and satellite，hyperspectral technique is considered as one promising tool to solve the problems in monitoring optically-complex waters．In order to apply hyperspectral techniques in the in—situ suspended sediment monitoring in estuarine waters，we earned out two cruises in the Pearl River Estuary in May 2004 and August 2006．Water samples were collected at each sampling station simultaneously．The original reflectance spectra wim 0．38 nm spectral resolution wcl'e re—sampled to 10 nm,and then the first-order and second-order derivative spectra were processed．Co．elation analysis was performed between the measured suspended particle matter(SPM)concentrations and each band．The results indicated that first-order derivative spectra，especially at the wavelength of 605 ran,could be used to estimate concentration of SPM at estuarine waters．11lis suggests a new way for the in-situ suspended sediment measurement and potential application to Hyperion and ILl-l satellite images in the optically-complex estuarine waters．
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