EEG can be affected reversibly by sedative substances, consist in a progressive slowing up to the occurrence of intermittent suppression phases and finally to a continuous suppression of the EEG. Analyzing electroencephalogram during anesthesia with specific algorithms derives different index. Various proprietary devices monitoring depth of sedation have been validated in adult clinical applications. The period from birth to adolescence is marked by a particularly rapid development and fundamental changes in brain connectivity, which are reflected in the different effects of anesthetics on EEG oscillations during this period, hence the application of these proprietary anesthesia depth monitors in children is still controversial. Non-proprietary EEG parameters are less affected by age and can assist in monitoring the depth of anesthesia in young children on the basis of routine monitoring. This article introduces several common proprietary anesthesia depth monitoring tools and non-proprietary EEG parameters and their characteristics and limitations, with the latest progress in their application in children, providing reference for the future development of anesthesia depth monitoring.