The Hui are predominantly Muslim Chinese who claim ancestry from Persian and Arabicspeaking regions in Central Asia and the Middle East. According to the 2010 census, the Hui are the largest Muslim group in China and its third largest ethnic minority with a total population of 10.6 million. Due to their extensive geographic distribution and longterm acculturation by the atheist Han majority, the question of Hui identity is rarely raised in humanities and social sciences both in China and abroad. This book examines Hui iden­tity in the rural area of Ningxia Hui Auto­no­mous Region, while taking account of Chinas rapid moder­ni­sa­tion and indu­s­tria­li­sa­tion in the twentyfirst century. Speci­fi­cally, it focuses on the massive internal migra­tion of rural popu­la­tions, which has been playing an essen­tial role in the socioe­co­nomic life of Chinese peasants in the past few decades. Based on field data collected between 2011 and 2013 among the Jahriyya Hui, the study seeks to clarify the impacts of migra­tion on the Huis ethno­re­li­gious iden­tity by inves­ti­ga­ting three key issues: the Huis purity concept, fasting and their belief in the after­world. In rela­tion to these refe­rence points, reli­gious rituals, inclu­ding comme­mo­ra­tion cere­mo­nies and the Ramadan fast as well as their chan­ging forms and values, are illu­s­t­rated and analysed. The thesis shows that Islam conti­nues to play a crucial part in drawing boun­da­ries and main­tai­ning iden­tity for the Hui both before and after migra­tion. However, popu­la­tion move­ments in Ningxia are resul­ting in increased inter­ac­tions between Hui and Han popu­la­tions as well as between Hui from diverse menhuan (Sufi paths). Conse­qu­ently, the Huis unique menhuan aware­ness is being weakened and their purity concept subjected to many queries, doubts, ambi­gui­ties, and tensions.