Abstract: As “important others” other than parents, the infants' peers of different ages have their own attributes and features, and they have the special influence on the infants' growth and development. Aiming at the problem which overlooks the value of infants' interaction with their peers of different ages in their early education, this paper has started from the connotation of such interaction and expects to reveal its significance. The infants' interaction with their peers of different ages is not only good to the development of their sociality and their emotions, but effectively promotes their cognitive ability, self-evaluation and self-regulation. Through the expatiation of affecting factors of infants' interaction with their peers of different ages, the paper has made further exploration of how to build a path of such interaction, and proposed some constructive suggestions for parents and early-education organizations, hoping to promote the healthy development of infants both physically and mentally.