The relationship between reflectance and suspended sediment concentration (SSC)is depended upon the wavebands sensed and the viedwing geometry of the sensor. The laboratory experiment report in this paper investigated these dependences. The reflectance in four wavebands (two visible and two near-infrared)of a large watwe-filed and wave -free tank were recorded as three variable were changed namely SSC, sensor viewing angle and relative sensor azimuth. The strength of the positive relationship between reflectance and SSC was shown to very with (i)wavelength as the maximum reflectance and SSC class separability occurred at the longer visible waveigths and, (ii)viewing geometry, as the reflectance SSC asymptote was dependent upon both the angle and azimuth of the sensor. The optimum condition for the sensing of SSC were concluded to be nadir in visible (0.55 and 0.65 um)and near-infrared (0.75 um)wavelengths.