What are the values of the middle class pipeline connecting children? The children's value connected by the middle class pipeline can improve their observation ability, and analysis can effectively expand children's thinking ability, guide children to mobilize their own cognition and form deep learning. Pipeline connection in middle class is an exploration activity carried out by middle class children by determining their own water sources, designing construction routes and making full use of observation, comparison and analysis in the process. By observing children, we can find the differences between similar things, improve children's observation ability, and then cultivate children's various recording abilities through various comparison methods, such as drawing and measuring. Finally, combined with analysis, it can effectively expand children's thinking ability, guide children to mobilize their own cognition, and form deep learning.