Waste incineration plants require automatic continuous monitoring main component content in flue gas, which include CO, HF, HCl, SO2, NOx and soot, while HCl and HF are the difficulties in detection.Under the condition of demand, the company developped a waste incineration HCl/HF analyzer.The principle of the system is based on the TDLAS technology, using the white pool  retracing optical path structure design,measuring HCl and HF by high temperature hot wet extraction method.