Examples are given to illustrate the infiltration of number combination thought, function thought and reduction thought in primary school mathematics textbooks.
In the sixth grade, the People's Education Edition has infiltrated the idea of combining numbers and shapes: for example, the number axis is the idea of combining numbers and shapes; the chapter of direct proportion and inverse proportion has changed the idea: for example, to find the surface area of a cylinder is to first convert it into plane geometry and find it with a simple formula, which is the transformation idea in geometry.