The methodology of this study is theory research. Based on art developmental psychology in children, this study will discuss the characteristics of art developmental stages in children, and develop principles of teaching ink painting to children. This paper will first review the related literature in theory of developmental psychology in children. In explaining the expression features on inkpainting in children and instruction methods, this study considers children in three stages: the first and second grades, the third and fourth grades, and the fifth and sixth grades. The paper will present the crux in ink-painting instruction, which includes elements of teaching, introduction to ink-painting tools, teaching strategy and principles in selecting teaching materials. Based on these, the study will design teaching nuits and instructional activities for children in the three stages. Finally, the paper will suggest ways for evaluation of both the instruction and the student's work, and then make conclusion and recommendation.