Why put the stone lion and Feng Shui in front of the government?

Shishi is a kind of sculpture with artistic value and ornamental value, which is carved into a lion with stone as raw material. As a common evil in the traditional culture of the Han nationality. The earliest stone lion was in front of Gaoyi tomb in the Eastern Han Dynasty. In traditional Han architecture, it is often used as an ornament. It can be found in palaces, temples, pagodas, bridges, mansions, gardens, graves and buttons in China. But more often, Shishi refers to a pair of lions placed on the left and right sides of the gate. I don't know when the lion became the mascot guarding the portal. And gradually merged with China culture.