This paper is about the influence of Albert C. Barnes on the development of John Dewey's theory of aesthetic education. Based on the content analysis of correspondences between Barnes and Dewey from 1917 to 1934, their relationship is discussed regarding two questions. One question is concerned about the psychological aspect of their relationship; what kind of personal relationship did they develop? They developed mutually intimate and sincere relationship, which helped them exchange and form their theories of aesthetic education. Another question is concerned about Barnes's theoretical support for Dewey's development of aesthetics. This study reveals that the support given by Barnes to Dewey is not only the knowledge of art, but also insightful thought on aesthetic experience, which consequently helped Dewey develop essential thoughts on his aesthetics. Such thoughts are classified into five topics: the knowledge of art, form of art, objectivity in taste, criticism, and reproductive aspect of an experience of art. It is concluded that with Barnes who agreed with Dewey's theory that the interaction between the live animal and the environment is fundamental to aesthetic education, Dewey was able to carry out his study of naturalistic humanism further in the field of art.