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For achieving the sustainable development goals, green development has been raised to a high position for cities in China. The economic development in Northwest China is slow, the ecological environment is fragile, and the mineral resources are rich. Only through green development can we realize the comprehensive income of regional production development, rich life, and good ecology. This paper measures the green development efficiency of 30 prefecture-level cities in Northwest China by using DEA-SBM model of unexpected output, explores the differences and causes of green development efficiency from the perspective of time and space through convergence coefficient, coordination matrix, GIS, and other methods, and empirically tests the impact of industrial structure, technological progress, and other driving factors on green development efficiency by using panel Tobit model. The results show that, on the whole, the efficiency of green development in Northwest China is low, path dependence is serious and unbalanced, the coordinated development effect of different regions is weak, and the spillover effect of core urban agglomerations has not been effectively exerted; from the perspective of driving factors, economic development, population density, traffic situation, and education investment can significantly improve the efficiency of urban green development, and the second is that the proportion of industries significantly hinders the improvement of green development efficiency, while the impact of scientific and technological innovation is not significant. Based on the empirical results, this paper believes that the harmonious development of natural environment and economic society can be realized only by improving the coordinated development effect among cities, implementing the optimization and upgrading of industrial structure, introducing excellent talents, and promoting the technological upgrading.

ObjectiveThe aim of the study was to analyze the impact of different migration arrangements on child welfare.BackgroundWith the rapid economic development in China, large numbers of migrants are moving to metropolitan areas in search of better jobs. They are faced with the dilemma of whether to leave their children behind in the countryside due to various socioeconomic factors.MethodA total of 1005 children with migrant parents and 532 children with nonimmigrant parents were included. An order logit method was used to estimate the impact of family arrangements on child welfare by using China Family Panel Survey Database 2016. To control for the initial heterogeneity of individual, family, and regional characteristics, propensity score matching was used.ResultsThe findings revealed that the types of family arrangement were complicated, with 66.2% of migrant children in the city with their parents and 74.1% of children were left behind in the rural area. Children who migrate to the city with their parents had significantly greater improvement in their math and Chinese grades, overall school performance, and better physical health than left‐behind children. The impact of family arrangements on mental health was not statistically significant. The impact of migration was more pronounced for children under 12 years of age.ConclusionParents' migration decisions have significant implications for child's welfare. The presence of parents and better educational and medical resources are conducive to school performance and physical health for children. The impact of life circumstances and social identity on child's psychological health needs closer attention.ImplicationsRelaxing the household registration system, making policy adjustments that aim to improve the standard of living in places where migrants relocate, and providing conditions for integration are positive, significant steps that could be taken to promote the physical and mental health of both left‐behind and migrant children.