The TREC (tracking radar echoes by correlation) method is used to estimate the TREC wind on CAPPI (constant altitude plan position indicating).The horizontal storm streamline field on CAPPI is first estimated from single radar observation data at two successive observation times,and then the motion direction of the whole echo field is extrapolated.The case experiments of typhoon,rainstorm,and boundary clear air echoes are performed,and the results suggest that the horizontal structure of the meso-scale systems is better revealed,thus favorable to the nowcasting of meso-scale systems.Besides,in the boundary clear air echo experiment,the interference of large ground targets with TREC vectors can be controlled by adjusting the correlation coefficient threshold.