Abstract: The conception of respiratory therapy of critical ill patients has extended from the respiratory support to the management of respiration and circulation. Compared with other traditional imaging tools， critical ultrasonography is simple， realtime， and reproductive， and can focus on multiple goals in the respiratory and circulatory system. The Chinese experts' consensus on CriticalUltrasound promoted by Chinese Critical Ultrasound Study Group (CCUSG) recently provided recommendations supporting the clinical practice. The paper was to describe the current uses of critical ultrasound in the respiratory treatment of critical ill patients， with an emphasis on the diagnosis and treatment of the respiratory disease， and to provide a framework for the practical application of this tool at the bedside.