土围楼是客家先民出于抵御兵匪、聚族而居的需求演变来的。在外族入侵,兵火连天的久远岁月里,人们为了避开战乱,开始建筑此类建筑以求自保。正统的土楼都是圆筒形状,一般的直径多在40-50米左右,高度也多在20米以上,外部用闽西的粘性黄土夯筑出一米多厚的柱形墙体,内部 Tu Wei Lou is the evolution of Hakka’s ancestors’ need to resist soldiers’ warships and ethnic groups. In the long years of foreign invasions and raging fires, people began to build such buildings in order to avoid self-insurgency. The orthodox earth buildings are all cylindrical in shape. They are usually about 40-50 meters in diameter and more than 20 meters in height. Externally, a sticky loess wall with a thickness of more than one meter is built with the sticky loess of western Yunnan.