Climate anomaly and atmospheric circulation features were analyzed over China in August 2011. Causation of drought in Southwest China (SWC) and less tropical cyclone (TC) activities over the western North Pacific and the South China Sea (SCS) were studied in this paper. Results showed that anomalous atmospheric circulation including positive 500 hPa geopotential height anomaly, the stronger West Pacific subtropical high (WPSH), weak summer monsoon, weak vapor transportation was the main reason for the SWC drought. Moreover, the SWC drought might be caused by the lag impact of 2010/2011 central Pacific La Nina event and warm mode of the Indian Ocean. In addition, less TC activities were due to the combined impacts of multifactors including weak convection over the SCS, abnormally northward monsoon trough east of Philippines, large vertical shear anomalies and the stronger WPSH.