Abstract: This paper takes Wu Primary School, a former state-owned farm school in eastern Inner Mon golia, as a case study to explore the mobility trend of rural middle-aged and elderly teachers, its characteristics and causes during the time of rapid urbanization. The study attempts to gain a deep understanding of the life choices of this generation of teachers under multiple situations from the perspective of historical changes and regional development. The study found that after many years of hardship, middle-aged and elderly teachers on state-owned farms had derived a collective identity that included three elements:survival security identity, emotional identity and attachment, and professional efficacy and self-identity. This triadic identity was based on the cross-construction of institutional identity, legal identity, and professional identity, emerged in the historical process of market reform of farming, farming units, and education system of state-owned farms. Such a collective identity reflected the value tendency and emotional belonging of members in a close social community, with collective status as the carrier, integrating collective interest, consciousness and emotional connection. In the end, in a paradoxical way the triadic collective identity promoted the construction of a psychological mechanism with "stability" as the core for this group of middle-aged and elderly teachers, forming a collective preference of remaining in the countryside and characteristics of attachment, and therefore revealing another side of abnormality that has received little attention in the field of rural teacher mobility. With the ongoing urbanisation in China, this"stable" psychological mechanism has great significance in promoting and improving the professional development of rural teachers and the quality of rural education.

Key words: rural teacher mobility, middle-aged and elderly teachers, collective identity, unit system, stability