Owing to the importance of studying infant external movements and expressions,and the uniqueness of infant humor characteristics,infant humor usually defined as the funny words or actions which can make infant laugh, and smile or laugh may be considered as the most obvious explicit sign of humor appreciation and production process. The appreciation and production of humor have been credited with many adaptive functions and evolutionary significances, including the enhancement of the physiological quality,cognitive and language abilities,acquiring more care-and-attention focused by caretakers and providing optimized social environment to develop baby’s cognitive skills. Qualitative methods are generally applied in infant humor researches,especially in observational and interviewing method. Researchers observe infant's humor styles,and developmental changes in some situation,in which researchers simulate daily humor or design novel humor. Infant humor consists of humor appreciation and humor production. Infant can perceive and understand some humor behaviors by comparing the reality with internal experiences in the process of humor appreciation. The development of humor production is later than humor appreciation,infant can learn and imitate some funny behaviors from others,and create some unique humor actions along with the development of cognition. The development of infant humor is mainly affected by their cognitive stage. Early infant humor related to the body,then to sensory perception, to verbal,humor content develops from abstractly to concretely,which show stage and succession feature. Parents should protect children’s humor nature by constructing a harmonious family atmosphere;exert the function of humor by following the law of the development;communicate with children humorously to enhance the interpersonal relationship.