The parent-child educational activities in museums can promote parent-child interaction and communication, and help parents better understand and discover children in activities. This paper analyzes parent-child conversation happened in museum educational activities from three dimensions of cognition, behavior and emotion, compares the differences of different conversation types and the entire conversation types. It analyzes the differences of conversation contents in different teaching steps and among different families. It is hoped that the research results could bring beneficial enlightenment to the design and development of educational activities in the future.