Guqin body materials are mostly made of sycamore wood, fir and pine and other tree species. The ancients have accumulated countless experiences in selecting materials, among which the two most important points are "hardness and sparse texture", and the second is "woodiness has been exhausted". Obstructed and transparent, its voice grows more and more.

According to records, the Indus is the most suitable for playing the qin, and it should be the accumulation of thousands of years of experience.

Tian Zizhi's "Qin Fa" records: "Zhuangzi said: music comes out of emptiness, emptiness becomes open, and reality hinders, hinders and does not understand, so why should music be made. But Tong's material, its conscience is empty and reason is sparse, and sparse reason is empty. It is unique in the mind and in the body, lifting is light, striking is loose, jin is brittle, and pulling is slippery.

The first-ever guqin - its mountains cannot be pointed, and the strings are not scattered. The sound came from between the two pools. Its back is slightly raised, like the leaves of scallops. The sound wants to come out and overflows, lingers and can't go away, but there is an aftertaste, its subtlety is like this