The dual polarization radar detection data of two forest fires are analyzed. The results show that: Ashes from burning forest fires rise up into the air and drift downstream to form a smoke plume. The reflectivity of the plume was around 20dBZ, with a small range maximum of 36dBZ. The time of two fires radar echo was maintained for 2h6min and 4h28min respectively. The farthest distance of the two floating objects spreading downstream with the environmental wind direction is 65km and 94km respectively, and the highest rising height reaches 3.7km and 4.8km respectively. The speed of the ambient wind was estimated with the front edge of the plume as a tracer, and the 1.5° elevation height estimated by both fires was about 12 m/s. Both wildfires occurred on sunny days, the ambient wind speed is not large, except for the edge of the plume, the velocity spectrum width is very small, mostly at 1-2 m/s. The range and area detected by the correlation coefficient (CC), differential reflectivity (ZDR) and differential phase shift (Φdp) are close to the morphology and area of the reflectivity, and also increase gradually along with the diffusion of the plume. The value of CC is very small, with most sites being less than 0.9, and a few range bin with CC values being below0.5. There are relatively small parts of ZDR over the fire point, between 2 and 3dB, in the