According to the formation mechanism of dioxins in solid waste incineration technology,the method to control dioxin second generation was proposed.It is confirmed that waste heat boiler flue gas at low temperature can avoid quenching of dioxin re-synthesis at low temperature region.But it is unfeasible to cool quick in flue gas low temperature area of waste heat boiler.It is proposed that the waste incineration flue gas system should be designed specially,low temperature inhibited the second generation of dioxin.