This research samples the textiles of the Atayal Tribe's Beishi Group and, through comparison and analysis, explains the expression of textile patterns and colors. These attempts are made to understand the unique characteristics of the relationships between forms and colors through statistics and analysis from a design perspective. The decorative motifs on the composite stripes of Beishi Group's textiles concern rhombus-shaped patterns, mortar-shaped patterns, zigzag patterns, circular patterns, square patterns, alternating patterns, and others. These patterns will be classified in accordance with the shape structure; the horizontally separated pattern is the most common one. If we attempt to analyze the detailed shape of the textiles, the rhombus-shaped patterns are the predominant. Also, we discover that there are similarities among the basic patterns and that the Group has already had their basic systematic concept of the form patterns. The colors constantly used in Beishi Group are black, gray, white, red, peach, pink, orange, yellow, green, blue, purple, coffee, brown, and other colors. The color in the patterning structure is white （or the ramie color）, which is used to demarcate the line of the shape, particularly the stripe colors on the clothes. White is a color used as the shape of the pattern on the lower part of the costume, such as the wraps and foot protection cloth. The basic colors （mainly the black, white, or red） are composed as a unitary shape with single color. The single color on the unitary shape and other colors are composed and repeated to highlight the rich patterning effects. The patterns on the different textiles indeed have a variety of combinations of colors, but the combination of colors does not have a specific fixed mode.