Guangzhou has implemented a “High School Entrance Examination Policy for Non-residents” for migrant children since 2014.The policy has allowed migrant children to apply for private high schools and secondary vocational schools in Guangzhou. At the same time，it has removed the “school-choice” fee for public high school admission，established a series of eligibility criteria，and set a quota limit of 8% of the total annual admission of public high schools. Based on the the analysis of the official statistics，this study shows that migrant children have increased in population size but have faced a decreasing number of admission quota，making their overall access to public high schools more difficult. While the top 5% migrant children have experienced minimal change to their chances of getting into public high schools，the migrant children ranked between the 10% and 25% have seen their chances reduced. Finally，the gap of access to public high school education between migrant children and local children has widened after the policy.