Relational mobility refers to the amount of opportunities people have in a given society or social context to select new relationship partners when necessary. As an objective indicator of socioecological psychology，relational mobility emphasizes how individual’s opinion on relational mobility effects individual’s mind and behavior. The research analysis how region and demographic variables effect the extent of relational mobility and further explore how relational mobility and demographic characteristic influence individual’s migration intention. The results indicated that 1）the participants show a middle level of relational mobility，and relational mobility is equilibrium across different geographical positions，different province’s economics development level，and different city size；2）female，student or in-service staff，undergraduate，private enterprise’s staff，and participants who live in downtown or marginal urban area or countryside perceive higher relational mobility；3）party and government official，foreign urban resident，family monthly income below 2000 yuan，and participants who live in indemnificatory housing or high-grade residential community perceive lower relational mobility；4）relational mobility，education，family monthly income，student，residence，housing type and community type have significant effect on participant’s migration intention. The suggestions on how to promote reasonable mobility are proposed based on those results.