Step 1: Draw the big stem of the tree of wisdom first, as shown in the figure below.

Step 2: Draw twigs from the trunk, as shown in the figure below.

Step 3: Draw leaves on the branches, as shown below.

Step 4: Draw details on the trunk, and draw flowers, grass and stones under the tree, as shown below.

Step 5: Color the leaves of the tree of knowledge (green), as shown in the figure below.

Step 6: Color the leaves and then color the stems and branches brown, and the tree of knowledge will be drawn, as shown below.

The law of children's cognition is "perception-representation-concept", and the use of knowledge tree teaching AIDS just conforms to this law, which can make students become attractive to active learning. Proper use of teaching AIDS in class can make students use appropriate tools when solving problems, and can make students naturally think of hands-on exercises.