Abstract: Recently, PM_2.5 pollution is serious in China and haze weather occurs frequently, which causes great harm to the environment and human living. The waste gas volume reduction is one of the important ways of controlling PM_2.5 pollution. By introducing the existing waste gas volume reduction control measurements at home and abroad, the requirement direction of waste gas volume reduction control technologies in the cement, steel and other industries were proposed in terms of waste gas recycling and cascade utilization. It was found that the emissions in waste gas volume, SO₂, NO_x and dust could be reduced greatly by the waste gas volume reduction control technologies. This would be beneficial to the pollution abatement of the PM_2.5 pollution. It was suggested that a feasibility analysis on waste gas volume reduction control technologies for relative industries should be made, and that the researches and demonstrations of the waste gas recycling and cascade utilization technologies be encouraged to carry out.