Shizheng (pinyin: shì zhēng) is a bow-pulling stringed musical instrument of the Wa ethnic group. Also translated as appropriate vibration, scholar struggle. The Wa are also called embarrassed or vibrating. Because Zhang has only one string, it is called a single-stringed qin in Chinese. It is popular in Ximeng Wa Autonomous County and Cangyuan County in Yunnan Province.

The shape is similar to the erhu, and the players are self-made and used, and the specifications and sizes are different.

When playing, squat down, support the piano bar with the left hand, place the bottom of the piano on the ground, the piano bar is inclined forward and form a 65° angle with the ground, lightly step on the piano barrel or the bottom column with the left foot to stabilize the piano body, and hold the bow with the right hand. Play outside the strings. Bow methods include continuous bow, split bow and bow. Can be used solo or as an accompaniment to singing and dancing. Wa youths are particularly fond of contention, and they often entertain themselves or sing by themselves in the dead of night. When young men and women are in love, the young man not only invites the girl to meet with the sound of the piano, but also expresses his love with the sound of music, and accompanies the love song sung by the girl. It is also used for occasions such as festivals, relocations and festive occasions.