Abstract: Little was known about the Peng’s Tusi administration before Xizhou (today’s Yongshun County in Hunan Province) Battle in 939.After the battle,Peng Shichou moved the Tusi official seat to what is known as Huixiping today.Since then,the Peng’s Tusi administration has experienced ups and downs and the Tusi official seat has moved to Longtan town,Laosicheng town,and Xinsicheng town.Among the sites,Laosicheng town is a Tusi palace,with military and political functions rolled into one.Regarded as a treasure in studying China’s Tusi system,Laosicheng presents the Tusi social structure in Yongshun.It is an important evidence to study China’s Tusi system,the relationship between central government and the minority people,history of Tujia people,and even the ethnic history in south China.The site of Laosicheng town shows the perfect combination between physiographic relief and military defense,providing an example for China’s history of urban development.

Key words: Tusi, Laosicheng town, military defense, movement of official seat