The temperature rise of the busway will change rapidly due to abnormal factors, but the wireless sensor can not keep high sampling rate and high uploading rate all the time because of the energy and transmission rate limit. A wireless sensor node dynamic sampling strategy, FDSI, is improved to automatically adjust the sampling interval and upload frequency according to the temperature rise rate. Firstly, the shortage of the original sampling strategy for sampling under the rapid change of busway temperature rise is analyzed. Then it changes the way in which the original sampling strategy adjusts the parameters. Finally, the Matlab simulation is used to compare the two methods. The results show that the dynamic sampling strategy of the adjusted wireless sensor is less than the original strategy, and the redundant sampling is less than the original strategy. This work is supported by National Natural Science Foundation of China (No. 61307063).