Juglans regia is a sport played by two Wan Wen walnuts in pairs, which is not affected by time, place and environment. Wan Wen Walnut requires deep and clear texture. Two Walnuts have similar texture, the same size and the same weight. Wan Wen walnut turns red after playing, which has artistic value and collection value because of its unique shape. Walnuts in Wan Wen are mainly divided into three categories: walnut, Juglans mandshurica and walnut, and Juglans mandshurica includes walnut, Juglans mandshurica, Juglans mandshurica and walnut, which are usually called the four famous kernels.