Abstract: In recent years, the operational meteorological observing system in the Tibetan Plateau (TP) and its ambient areas has been improved by using advanced equipment and adding new sites. Furthermore, a new integrated observing system in TP and its ambient areas (NIOST) was built by implementing the international cooperation project funded by JICA (Japan International Cooperation Agency). Based on previous research results and improvement of observing condition in TP and its ambient areas, as well as the enhancement of observing ability of State Key Laboratory of Severe Weather (LASW), the observation experiment to convective cloud and water vapor in the east edge of TP (ETP) could be conducted. This experiment chiefly focuses on the variations of convective cloud and water vapor transportation in ETP, and deals with their impossible impacts on disastrous weather. To enhance the forecasting capability of numerical model, we will study the contributing factor of severe weather and multi-scale feature of water cycle in ETP, and then improve the parameterized scheme of cloud physical process in TP and its ambient areas.