Abstract: Based on the conventional meteorological observation data, the NCEP FNL(National Center for Atmospheric Research Final Analysis) reanalysis data and the numerical simulation results of the WRF(Weather Research and Forecasting) model, the formation and evolution process and the microphysical characteristics of the embedded convective clouds occurring in Liaoning province on July 1, 2010, were analyzed.The results show that the WRF model performs very well in simulating the convection process.The embedded convective cloud occurs in conditions where there are stratiform clouds in the upper atmosphere and scattered convective bubbles in the lower atmosphere.As the convective bubbles in the lower atmosphere develop and grow continuously, and till extend to the height of stratiform clouds, the embedded convective cloud is formed.With the eastward movement of the stratiform cloud, the embedded convective cells merge and split repeatedly, and the obvious right shift of the convective fluids appears in the splitting process.In the cloud system, there are not only warm cloud precipitation mechanisms that cloud water can be directly converted into the rain, but also cold cloud precipitation mechanisms of seeding-supplying.Both mechanisms are the most active in the mature stage.The intensity of convergence at a low level and divergence at a high level is the strongest in the development stage, which is the most favorable for the development of a cloud system.