1. Liu Zi's operas are diverse in genre, rich in qupai, melodious in tune, elegant and beautiful in rhetoric, and have their own style, which can provide relatively original materials and evidences for studying the development history of China's operas since the Northern Song Dynasty.

2. The unique music and vocal cavity style of Liu Zi opera is a specimen for studying the ecology of early chord vocal cavity, which has high scientific research value.

3. The development of Liu Zi's traditional operas from the palace to the folk, back to the palace and then to the folk is of unique artistic value for studying the history and culture of the palace. At the same time, it is also a historical witness of politics, economy and culture in the Central Plains, and an artistic treasure of the people's cultural life in the Central Plains.