Abstract: Behavior is the most direct way for infants to express their needs and emotions, and it is also an external manifestation of psychological development. Observing the behavior of infants allows for the acquisition of more detailed and authentic information regarding their behavior and development. Behavioral observation and analysis based on video coding has established conditions for comprehensive and objective research and analysis. This paper introduces the video coding methods and their research applications in infant behavior analysis from three aspects: video acquisition, coding methods, and coding tools, with the aim of providing an effective approach for the study of infant behavioral observation.