Free Choice of materials or implements by children is desirable with their steps of growth. Children’s capacity to think and the creative spirit to accomplish anything of the art in which they are interested in will be fostered and developed. Use of diverse materials and the freedom of expression must provide them with creative power. When viewed from this presumption there arises a problem in giving them always the same size of painting paper as drawing materials. In this study 4 different types of painting paper of 39.2×36.1cm, 32.3×22.6cm and 26.5×19.4cm have been adoptet to test expressional capacity according to the factors of length of time, contents and format and to find out, analyze, and prove various conditions for adequacy of size of painting paper and length of time which will brind about improvement of materials for expressional activities as well as well as lor the realization of expression to as fullest extent as possible. The fundamental implement of test in this study was painting paper for test. Drawings were made on 2976 pieces of papers each sized 39.2×36.1cm(6 Fold), 38.9×26.9cm(8 Fold), 32.3×22.6cm(10 Fold), 26.5×19.4cm(16 Fold). Subjects of this study have been made from 744 children aged 6 and 7 extracted from 15 kindergardens in Seoul and dealt in statistics with x² verification. Each of 744 children from Kindergarten were made to draw freely 4 times with crayon pastel to find out that there were hardly and difference among expressions of theme and color, but there were difference among the format and length of time for expression. Thus, it was infered that distinct differences in expressional conditions were caused by the different sizes of painting paper and the most suitable size of paper for the zone of age is 32.3×22.6cm~26.5×19.4cm, and the suitable length of time lies in 20~30 minutes. This study reveals how the different sizes of painting papers and different length of time affect the motivation for expression. The use of various materials could be diversified with penciles, sign-pens, dyes, but the same stuff was employed to fix the variation of the factor of utilization of space of a certain size of paper. Even through it is regreatful that there remains the difference of length of time of expression on the painting paper according to the use of materials not determined, I wish that this study can serve a practical assistance as a data for art education.