Applications of vertical velocity in forecast are studied by analyzing the vertical beam data of Beijing wind profiler radar (WPR) data. The different weather cases are analyzed via vertical velocity classification display and surface meteorological records. The results show that the vertical velocity measured by WPR is small in clear sky between ±1 m·s-1. But in precipitation days, boundary vertical velocity is mainly toward to the ground with different speeds between precipitations in different phases. The results indicate that vertical velocity probed by WPR has application values in researching vertical velocity in clear sky, judging the precipitation phases and forecasting precipitation.