Abstract:How to use the echo changes of new generation of weather radar before and after the operation in assess ment the result of artificial precipitation enhancement is very important for improving the scientificity of weather modification. In this paper, the method of tracking the seeding coverage based on both maximum correlation coefficients (TREC) and a new generation of weather radar three dimensional CAPPI grid data is realized by considering multiple effective duration and the seeding coverage in artificial precipitation enhancement by antiaircraft guns and aircraft. Meanwhile, the echo parameters such as maximum reflectivity, VIL, etc., are calculated. Besides, the paper also analyzes the rationality of echo tracking method by using two precipitation processes and continuously tracking the related areas. One artificial precipitation enhancement operation by antiaircraft guns in Beijing and one artificial precipitation enhancement simulated by aircraft are chosen to track the seeding coverage. The result indicates that using the algorithm TREC, we can track the echoes reasonablely in both vertical and horizontal positions in space, and also can track well the echo change in seeding coverage during artificial precipitation enhancement operations by single or several antiaircraft guns and aircraft. So, the work provides a meaningful scientific reference for the assessment of artificial precipitation enhancement.