The concave convex digital version model is a wooden digital counting board used as a teaching tool for young children's mathematical enlightenment. It consists of a wooden board, colored counting beads, and a plastic pen. The wooden board has 10 grooves corresponding to the numbers 1-10, and the colored beads inside the grooves can slide along the grooves. In teaching, move beads to count and understand the actual quantity correspondence of numbers such as "1" and "2"; Use a plastic pen to draw along the number grooves and practice writing numbers. The color and sliding design of beads can stimulate children's interest in learning and establish a sense of numbers through operation.