Precipitation stratiform cloud systems were detected and catalyzed by using airplane with airborne Particle Measuring Systems (PMS) and satellite Global Position System (GPS) in September 13, 2002 in the Northern Shaanxi Province. It shows that in the influenced areas by catalyzing the numbers of little ice crystals increased in order of magnitudes and partial melting layer's prominence in radar RHI was formed because of melting layer's increased local temperature. The cause may be the supercooled water consume melting latent thermal after LC catalysis.