Abstract: Electrical impedance tomography (EIT) can monitor pulmonary ventilation in real time and non-invasions by obtaining the changes of pulmonary bioimpedance. It can guide the setting of individualized positiveend-expiratory pressure (PEEP) in mechanical ventilation. Compared with the methods of titrating individual PEEP such as lung compliance, driving pressure and pulmonary ultrasound, EIT has the advantages of visualization, real-time dynamic observation of the overall and local lung ventilation. This paper reviewed the principle of EIT, the function of PEEP, the setting of individualized PEEP with EIT parameters and its limitations, in order to provide reference for the clinical application of EIT.