西域有广义、狭义之说。从狭义来说 ,是指玉门关以西 ,天山南北的广大地域。特定的地缘区位使这里自古以来就成为沟通东西方文明和各民族间相互交往的桥梁。魏晋南北朝时期 ,由于缺乏中央王朝对西域各种政治势力强有力的制衡 ,西域与中原形势相似 ,亦是一个政局动荡、民族大迁 Western Region has a broad sense, narrow sense. In a narrow sense, it refers to the west of the Yumen Pass and vast areas north and south of the Tianshan Mountains. The specific geo-location has made it a bridge since ancient times to communicate the civilizations of East and West and the various ethnic groups. During the Wei, Jin, Southern and Northern Dynasties, due to the lack of a strong check and balance between the Central Government and various political forces in the Western Regions, the situation in the Western Regions and the Central Plains was similar. It was also a political turmoil and a great national relocation