Compared with the stepped pyramid in Sakala, the regular triangular pyramid in Giza has made remarkable progress, with a more concise and harmonious shape and a square bottom, which is arranged in four directions: east, west, north and south. Then four regular triangles are formed according to the length of each side, and the angle formed at the top is 5152', which symbolizes the light of the sun. The largest pyramid of khufu, with a vertical height of147m and a side length of 230m, consists of 2.7 million huge stones (artificial stones), each weighing about two and a half tons. There is no adhesive between stones, and a solid whole is formed by precise stacking and pressure. Its majestic, stable, lofty and majestic image symbolizes the supreme authority of the king. Inside the pyramid, there are tombs of kings and princesses, and there are ventilation holes in the middle to keep the interior dry, so that the mummies of kings and concubines are well preserved. It is said that the designer of pyramid of khufu is Homon, the younger brother of King Khufu.