To address how to use computer-digital patterns with the Characteristics design is a challenging problem. Taking the feature of Xinjiang Folk textile patterns as an example, a method is proposed in the paper to research generation a random pattern Triangle-based seamless to tile hexagonal. First, embedded pattern is transformed into a triangle as the first primitive using bilinear interpolation. Then, by positive and negative direction rotation of 120 angles, it is expanded into two equilateral primitives. A new design pattern is generated by tiling these equilateral primitives into the specified window which are randomly selected and transformed of geometric symmetry and rotation. There are the characteristics of random, symmetrical, and seamless tile in the proposed algorithm. The designing process validation was carried through experimental. The proposed method is closely keeping the national style of design, it has the nice generalization ability and a promising future in the digital design fields of Xinjiang Ethnic fabric pattern, advertisement and costume design.