Su Jiaoban, taking Changzhou's second-grade math book as an example, uses books, some textbooks of this edition, because these versions of the textbooks of Su Jiaoban are applied to some versions of Jiangsu, and then the textbooks of Su Jiaoban are used in the category of math classes from grade one to grade six.

Then in the seventh grade, that is, junior high school, there is a process of transferring to the People's Education Edition. Therefore, the second-grade math book uses the textbook of the Soviet Education Edition, and the difference between this textbook and the People's Education Edition is still very big, that is to say, the arrangement of the two textbooks and some contents of knowledge points are very different.

So the final conclusion is that Changzhou second-grade mathematics is the textbook of Jiangsu Education Edition.