Introduction to Tomb No. 131: Tomb No. 131 is a tomb for both men and women. Because the tomb is shallow from the surface, most of the human bones are destroyed, but from the remaining bones and traces, it can be concluded that it is a tomb for both men and women. This is the second example of heterosexual tombs in the Tanshishan Culture. The male is lying on his back with his limbs straight, while the female is bending her limbs sideways and facing the male. This phenomenon reflects the establishment of patriarchy in the late Tanshishan Culture.