A high speed camera-infrared camera synchronous shoot device is built to record the process of cold droplet impacting on hot pool and lots of experiments have been done in this paper. The mixing morphology and the temperature variation of the impact area are observed and analyzed based on simultaneous images taken by the infrared camera and the high speed camera. The influences of the impact conditions on mixing and heat transfer during droplet impacting on hot pool are also studied and then the dimensionless relationship between mean temperature of the impact area and impact condition is established. The experimental results show that the mixing of cold liquid from droplet and hot pool is one of the main reasons for the temperature increase in impact area. The cold droplet does not integrate with hot pool immediately at the beginning of impact and the droplet is deformed into a shape of " crescent moon” which is trapped near the crater. The interface between cold liquid from droplet and hot pool can be observed in a simultaneous image. When the crater begins to collapse, the mixing liquid is mainly divided into two parts: one part is left and curled at the bottom of the pool while the other part is rising with the central jet. Despite the stagnation at the beginning, the mean temperature increases with time going by in the early stage. However the growth trend is interrupted by the cavity collapse. The mean temperature arrives at a peak after the crater has reached its maximum depth. The peak of the dimensionless temperature $T_{{\rm{peak}}}^{\rm{*}}$ increases with the Weber number increasing and $T_{{\rm{peak}}}^{\rm{*}}$ can be described as $T_{{\rm{peak}}}^{\rm{*}} = 0.34W{e^{0.15}}$ . The dimensionless time of the peak ${\tau _{{\rm{peak}}}}$ increases with the Froude number increasing. In this paper, we also find that the dimensionless time of the peak ${\tau _{{\rm{peak}}}}$ can be described as ${\tau _{{\rm{peak}}}} = 0.85F{r^{5/8}}$ . After the mean temperature reaches the peak, the growth trend presents a trend of fluctuations. The shape of the trend line during this stage is related to Weber number. When the Weber number is small, the growth trend of mean temperature decreases in a short period of time and then restores and increases with time going by. When the Weber number is bigger, the growth rate becomes smoother during the long fluctuation period. The mean temperature will increase very slowly at the end of the impact. Only some cold spot are left on the surface during this period and the rising of the mean temperature becomes steady and slow.