Explore the position relation material of the circle is a teaching tool that intuitively demonstrates the positional relationship between circles, circles, and straight lines, including movable circular sheets, straight lines, and coordinate bases. In teaching, sliding circles or straight lines can demonstrate the positional relationships between five types of circles: outward, outward, intersecting, inward, and inward, as well as the relationships between circles and straight lines that are outward, tangential, and intersecting. By comparing the values of the distance between the center of the circle and the radius, understanding the criteria for determining positional relationships, and helping students grasp the laws of positional changes, it is a practical tool for teaching the properties of circles in junior high school.