Relational mobility is defined as the degree of options in a given social environment regarding interpersonal relationships and social groups. Compared with societies with low relational mobility，people in societies with high relational mobility have more chances to select and change whom to relate to. The data was from CASS-Intellvision Social Mentality Survey 2017. Social-moral behaviors included prosocial behaviors，altruistic behaviors and social-norm related behaviors in this report. The attitude and the frequency of social-moral behaviors were evaluated in the survey. Social-moral behaviors in urban and rural areas were analyzed. Relational mobility differed between urban and rural areas. The moderating effects of relational mobility on attitude of social norm related behavior，the frequency of prosocial behaviors and altruistic behaviors in urban and rural areas were revealed. How to promote social-moral behaviors related to social changes was also discussed.