First, the ground should be flat and then compacted. It is best to pad a layer of gravel with a thickness of 10- 15cm. If not, spread 5cm with sand. Then, lay red bricks. After the red brick is paved, you sprinkle a small amount of sand on the brick surface, sweep it with a broom, and try to fill the sand into the cracks of the brick to make the sand jam the brick and prevent the red brick from loosening.