Abstract: To solve the problem of inaccurate measurement for dust concentration by angle scattering method under ultra-low emission conditions, a simulation model of dust angle scattering was built based on Mie scattering theory. Considering the features of ultra-low emission dust particles, simulated calculations were conducted under different parameters to analyze the effects of following factors on the angle scattering measurement of ultra-low emission dust, such as the laser wavelength, detection angle, relative refractive index, particle size and particle concentration, etc. Results show that the particle size, dust concentration and refractive index have a great influence on the selection of key parameters for the measurement system. The incident wavelength and the detection angle should be determined according to the properties of ultra-low emission particles.