Other popular vocal cavities have made great progress, which is refreshing. Therefore, Kunqu opera spread quickly, spread to all parts of Jiangsu and Zhejiang, and became a kind of drama that overwhelmed other southern operas. Because of its simplicity, "Haiyan Opera" is inevitably replaced by the declining perfect Kunqu Opera. In the book Qulv in the thirty-eighth year of Wanli, it was written: "In the old days, those who sang southern tunes were all' sea salt', but now' sea salt' is weak and called' Kunshan'". Even during the reign of Qing Kang Gan, it was lost in the sea salt in Zhejiang, its birthplace. The decline of Haiyan Opera is not only that the musical form is not as rich as that of Kunqu Opera, but more importantly, it lacks representative classics handed down from generation to generation. Until today, people will still feel sorry when they study it. It's a pity that Haiyan Opera didn't leave scripts, tracks and other materials, and there were no props, which brought more difficulties to scholars and experts who studied the drama. All along, people think that the real sea salt cavity has disappeared. However, I believe that in the remaining Haining shadow play in Jiaxing and the instrumental tunes sung by Mr. Haiyan's sister-in-law, the voice of Haiyan cavity may still be retained. Among them, Haiyan Sao Zi Opera is also called "burning paper" and "sound" (both are homophonic). This is a folk ritual song. The singer's name is Mr. Sao Zi, and he calls himself a pilgrim. In the old days, when people got married, celebrated their birthdays, made sick wishes, or invited the God of Wealth and the Queen of Silkworm Flowers to hold a banquet at home, they all asked singers to "present documents" (sing songs of Sao Zi), greet the gods and send Buddha, burn incense and offer offerings, which were used for sacrificial entertainment and praying for disaster relief. At present, there are more than 100 kinds of known SAO Zi bibliographies, which are divided into two categories: one is "Shenshu", which records rituals and praises gods and buddhas, such as Jade Emperor, Tathagata, Guanyin, Guandi and God of Wealth; The other is "Tang Shu", which means tea and is an after-school program. Cities such as Cao Bin Puge have ten rare wishes. , lively, can improvise. The soup fell, the crowd sang along with the singer, and the brand band helped to accompany it. The atmosphere at the scene was lively and the mood of the masses was high.