From 2016 to 2020, China successfully assisted 9.6 million people below poverty line, making a making a substantial contribution to both the UN-defined Sustainable Development Goals (SDGs) and the global effort to reduce poverty. The literature reveals a focus on resettlement justice concerning livelihood transformation, re-siting, and public participation. However, a dearth of scholarly perspectives exists regarding migrants' comprehensive satisfaction indicators of just transition, particularly on sustainable assessment. Therefore, the study regards migrants as “customers” of PAR projects and assesses the degree of realization of a just transition of resettlement through their satisfaction. A multilayered comprehensive evaluation model is being formulated using the survey data of 515 migrants residing in three county-level cities in Nujiang Prefecture of southwest China. The results show that there is an increase in satisfaction with the impact of PAR on the migrant households' income, material assets, housing conditions, infrastructure, natural environment, children's educational level and ethnic cultures. Moreover, satisfaction with migrants' employment stability, social networking level, and the succession of local customs decreased. The results help to show that the PAR project does affect various aspects of migrants' lives, as well as contributing to the SDGs of social, economic, and environmentally sustainable development. The construction of a sustainable assessment system oriented to the combination of different dimensions of migrants' satisfaction and importance can help reduce the inequalities that may arise from the project. Boosting migrants' overall satisfaction is the most significant factor to consider when developing robust policies to increase poverty alleviation achievements and promote sustainable livelihood development.