Abstract: Based on encryption automatic station data and sounding data and NCEP reanalysis data and the data observed by radar and satellite data, the heavy rainfall event on 12-13 July 2013 in Shandong Province has been diagnostically analyzed. The result shows that the subtropical high has a short-term adjustment after Typhoon “Soulik” trough landed. The south airflow of subtropical high on the west side flow into the inland, and meet with weak mid-latitude cold air, triggered the instability energy release. The heavy rain occurred in deep warm current and deep strong upward movement of the zone. Heavy rain fall area and the direction of movement with the strong upward movement of the center of relevance is better. The heavy rains happened on the surface of the formation of the multiple small and medium scale convergence line. The ground of small and medium scale convergence line and terrain has certain corresponding relationship. The terrain effect on precipitation has increased. TBB corresponds to the zonal distribution of multiple mesoscale convective cloud cluster, the strongest genting bright temperature is usually between -40--50 ℃. Echo in south of the zonal distribution of stratiform cloud echo constantly have new development of medium and small scale convective monomer, and arranged in a narrow strip, causing strong convective precipitation in Radar.