Lung recuritment maneuver (RM), serving as an important treatment for acute respiratory distress syndrome (ARDS), is significant for improving oxygenation and reducing mortality.Although RM has been widely applied in clinical practice, the evaluation on effect of RM remains uncertain.There are several methods for monitoring RM effect and evaluating the ability for recruitment, including computed tomography (CT), ultrasound, electrical impedance tomography (EIT), and other respiratory mechanics parameters.All the methods have respective advantages and disadvantages.CT and EIT are able to monitor the changes of regional tissue more accurately, while the risk of transportation exists and complicated quantification process required; ultrasound has a higher sensitivity but lower accuracy on effect of RM; the respiratory mechanic parameters are eligible for reflecting the general function of lung but less satisfactory for monitoring the regional changes.As a consequence, a comprehensive application of several methods is required to achieve an accurate assessment on RM.