For a long time, the majority of China, which has the world's largest population, has been immobile and lived in rural areas. However, over recent decades, with the economic rise of China, rural labor has demonstrated a trend of moving to rapidly industrializing regions in search of higher income and better employment opportunities. Along with the labor cutback, out-migration introduces negatives to the sustainable development of rural areas, i.e., depopulation, the abandonment of rural settlements and agricultural lands, and the aging of the population, among others. Due to the threats of labor outflow to sustainability, studying the causes of China's rural out-migration can reveal lessons on how state policies can be designed to reduce the negative impacts of out-migration on rural communities. The purpose of this paper is to identify the major causes of migration movements among the rural areas of northern China that are considered to be the best-performing among the provinces of the country in terms of rural development, agricultural production, and the wealth of rural dwellers. A two-stage survey of a panel of experts involved: (1) respondents representing government officials and universities of the Heilongjiang, Jilin, and Liaoning provinces and the Inner Mongolia Autonomous Region, and (2) regional and district levels of administration, and research and public establishments of Heilongjiang Province. In stage three, drawing on the authors' own survey of 128 rural households in three counties of Heilongjiang Province, the major migration drivers have been identified, and the portfolio of a typical rural migrant has been developed. Some of the key findings are that migration intentions are fueled by the rural-urban income gap, poverty, a reduction of demand for labor in rural areas, underdeveloped infrastructure, the low quality of social services in rural settlements, and the low social standing of rural dwellers. The approach allows monitoring the dynamics of migration attitudes as responses to the policy interventions that are aimed at the sustainable development of rural areas.