In hydrological

oceanographic

environmental and ecological investigations

there is usually a great demand for a new technique to remotely detect chlorophyll concentration （CC） in different water depths. However

the conventional optical methods and optical remote sensing techniques can not meet the demand. This paper describes a new technique which can remotely detect CC in different water depths and a suspended solids concentration determination （SSCD） device specially designed for this purpose. The water samples from different depths of water can be pumped into the SSCD device

then their CC were remotely detected by a portable spectroradiometer. It only took about four minutes to finish one CC remote detection. The new technique is dozens of times more efficient than the traditional spectropho-tometric

fluorometric and chromatographic methods. The results of in-situ CC remote detection of 29 fishponds showed that the average relative error of the new method was only 3.8%. Since the new technique has great advantages such as low cost

high efficiency and no need of sample collection and sample pretreatment

to which all the conventional methods are im-. comparable

it is well worth extending it into hydrological

oceanographic and environmental investigations.