China is very rich in coal. The direct burning of great amount of coal leads to serious environmental pollution. The control and supervision of particulate emissions are thus one of the most important problems faced now in China in order to improve the air quality and living conditions. The direct and accurate measurement of mass concentration and particle size are concerned in this respect. Several methods have been used for this purpose, but they can not meet all the modern requirements. In this paper, based on the light scattering, a novel method is presented which is able to make on-line, continuous and direct measurement of particulate matters in different industrial emissions. Experimental study was performed. The results of measurements are given and discussed in detail.