The TREC algorithm，based on maximum correlation coefficients, is used in the successive tracking of selected radar echoes, and its effectiveness is evaluated by using the CAPPI grid data from Yangjing, Shenzhen, Guangzhou, Meizhou, and Shaoguan radar stations. The results show that, for ordinary mixed clouds, this particular TREC method is effective within a certain time limit, but its stability becomes weak with time beyond the limit, which leads to less satisfying tracking results. Also included is an application case of the TREC algorithm for weather modification operation in Beijing. Tracking is made with the CAPPI grid data to locate different cloud systems in different operational periods. The area of pixels exceeding the threshold and the total VIL of the tracking areas are calculated simultaneously, which can be used as the evaluation reference for weather modification operations.