To study the influence of protective farming methods on wind erosion in farmland and particulate emission in the surrounding areas of Beijing city,the wind erosion rates of farmland and the emission situations of TSP,PM₁₀,PM_2.5,and PM₁ under different wind speeds and different degrees of coverage were compared by wind tunnel experiments,and the proportions of these 4 kinds of particulates in Aeolian deposits were analyzed. The results showed that: (1) When the wind speed is less than 12 m/s,a mere 20% of straw coverage would significantly lower the wind erosion rate,and when the wind speed is greater than 16 m/s,a coverage rate of at least 40% could resist wind erosion effectively. (2) The relationship between the emissions of TSP,PM₁₀,PM_2.5,PM₁,and wind speed was a positive exponential function,and that with the coverage was a negative exponential function. As wind speed increases,the releasing abilities of 4 fine particulate matters could be represented like this: A > B1 > B2 > B3 > B4 > B5. When the coverage rate was less than 10% or greater than 60%,the differences of bust sizes of fine particulates decreased as wind speed rose,and when the rate upped to more than 60%,the bust size tended to be stable. (3) The proportions of 4 fine particulates in Aeolian deposits decreased as the wind speeds increased,and the numbers became stable when the coverage rate was greater than 60%.