Abstract: To achieve an even distribution of cut tobacco in a silo, a control system for cut tobacco spreading was developed with laser scanning bulk profile reconstruction technology. A laser scanner is used to measure the height of bulk tobacco in the silo. In case that the height difference H between the peak and the valley exceeds the threshold H₀ and the valley area M in the cross section of bulk tobacco is no less than λS (λ is area proportion factor and S is the increment of section area of cut tobacco spreading), the step distance of spreading vehicle is adjusted to reduce the height difference and change the status of tobacco bulk profile. The results of the developed control system showed that: 1) The height difference of tobacco bulk profile decreased from 139 mm to 67 mm, its standard deviation reduced from 79 mm to 50 mm, and the coefficient of variation reduced by 5 percentage points. 2) The variations of moisture content, filling value, the proportion of integral tobacco strand and the proportion of short tobacco strand were 0.08 percentage point, 0.1 cm³/g, 2 percentage points and 0.3 percentage point respectively, which were superior to those before the application of the system. 3) The standard deviations of moisture content in cut tobacco, the proportion of integral tobacco strand and the proportion of short tobacco strand reduced by 0.07, 0.49 and 0.10 percentage points respectively. This technology provides supports for promoting the stability of primary processing process and the processing quality of cut tobacco.