Introduction to the Sixiang Tanyu Diagram in Mayi: The Sixiang Tanyu Diagram in Mayi is a stone seal. The seal is copied at a scale of 1:100 based on the cultural relic "Fantian Seal" of Macheng during the Ming and Qing Dynasties. It is carved from Macheng's local stone. It contains a map of Macheng in the early Ming Dynasty. It is a seal that Taoist priests must use when singing rituals in the ancient burial customs of Macheng. It clearly indicates the names and locations of the four townships of Macheng. The appearance of this seal provides strong physical evidence for the geographical location of Xiaogan Township in Macheng and the authenticity of its existence.