Originated in Kunshan at the end of the Yuan Dynasty and prevailed in Suzhou. At first, it was called Kunshan cavity, and together with Haiyan cavity, Yu Yaoqiang cavity and Yiyang cavity, it was called the four major acoustic cavities. During the Wanli period of the Ming Dynasty, the Kunshan accent, which was "beautiful and far-reaching, surpassing the three plays", was just a kind of Qingqu popular in Wuzhong. During Jiajing and Qin Long years, Wei Liangfu, a native of Nanchang, Jiangxi Province, thought that some Nanqu vocals at that time were "straight and straight, without intention", so on the basis of the original Kunshan cavity, referring to the advantages of Haiyan and Yuyao, he absorbed some singing techniques in northern music (that is, decorative techniques such as "cadence, crosstalk, stopping, stealing and sticking with the cavity") and made Kunshan cavity. Wei Liangfu pays great attention to articulation, excessive articulation and radio reception in his singing. At the same time, with the help of the famous northern stringed instrument Zhang, "the syllables of stringed instruments are more fixed, so that they are similar to the southern sounds." It was changed to a three-string style, with a slightly thinner body and a round drum, made of civil wood and named Heizi (that is, the "southern string" used in Kunqu Opera and Tanci). Together with Qu Di, Huai Drum and Violin, it is a characteristic accompaniment instrument of Kunqu Opera. This new cavity is characterized by gentleness and smoothness. "Call water mill, cold cuts. The sound is flat and harmonious, and the words are even at the end of the head and abdomen ... The mouth is light and round, and the sound is pure and thin. " It has become a new voice that blends North and South songs. The song is called Kunqu opera, and the song is called Shile. But at this time, Kunqu opera is still a oratorio, which has not yet been able to reflect the script and shape the stage. Kunqu Opera was put on the stage by oratorio and became a drama, which began with Chen Liang Yu's "Huansha Ji". Liang Chenyu believes that Kunqu opera should not be confined to singing in the music arena, but must be extended to the stage to occupy a broader world. So he wrote "The Legend of Huanshaji" and put Kunqu opera on the stage for the first time. Since the early years of Wanli, Kunqu opera has spread rapidly to Jiangsu and Zhejiang provinces, becoming a kind of drama that overwhelms other southern operas. Then it was brought to Beijing by the scholar-officials, and became a big drama in Yuxi Palace together with Yiyang Opera, which was called "Official Opera" at that time. Taking this as a starting point, Kunqu began in Kunshan, Suzhou and other places, and quickly spread to the north and south of the river. After Wanli, the popular area of Kunqu opera gradually expanded, and four centers based in Suzhou, Nanjing, Hangzhou and Beijing were formed throughout the country.