Outline 1. Introduction 2. Solar Activity and Stratospheric Circulation 3.AO and Stratospheric Circulation Anomaly 4.AO and Mei-yu in China 5. ConclusionOutline 1. Introduction 2. Solar Activity and Stratospheric Circulation 3. AO and Stratospheric Circulation Anomaly 4. AO and Mei-yu in China 5. Conclusion