Because Cao Hongyan's ceramic kiln mouth was established late and its popularity is not high, it is a third-line kiln mouth. The first line is spring breeze, Yu Xiang, Xiaoya and so on. The second line is Zhongjia Kiln and Fenghuang Chai Kiln.

The evaluation criteria of kiln mouth are as follows:

1, start a school and create a subdivision.

2. Carry forward the past and forge ahead into the future, and the aesthetics and height of products have reached a new height on the basis of predecessors.

3. If it is not groundbreaking and has not been pushed to a new height on the basis of predecessors, it can only be regarded as the second and third line kiln mouth.