Rural to urban migration has become a prominent phenomenon in China. In linking migration to children's school trajectories, this mixed-methods study explored a range of cultural and contextual factors that contribute to Chinese children's school wellbeing in the migratory process. The key variables included acculturative attitudes, economic stress, and relationships with family, teachers and peers. The study drew upon survey data from a sample of 301 Chinese migrant students (4th-9th grade) together with in-depth interviews involving ten selected students focusing on how migrant children's school happiness and productivity are influenced by acculturation, economic hardship, and social relationships. The quantitative analysis indicated the critical role of integrative states in promoting school satisfaction and achievement. Migrant children with better social relations scored higher levels of hope, which in turn contributed to better school outcomes. Contrary to previous findings, economic stress did not hinder school outcomes for these Chinese migrant children, but appeared to act as a positive motivational factor for pursing academic success. The qualitative analysis echoed the quantitative findings, and provided further explanations for the complexity and particularity of these phenomena.