Dust concentration measurement instrument is widely used in environmental monitoring system,but in the experimental stage,smoke sampling is not easy to get dust,and the actual concentration of dust in the flue can’t be adjusted with the experimental requirements.Aiming at the problem,a quantitative concentration dust generation device was designed,and it is composed of a micro feeder,a variety of components and instruments.The concentration of dust was monitored in real-time by the host computer.On the basis of Mie scattering,the experimental device was constructed based on light scattering method.The optical signal was collected by CCD.The experimental results show that the system can realize the real-time measurement of particle concentration.