Since 1997, Hong Kong's reintegration with China has been founded on the principle of 'One Country, Two Systems', which serves to guarantee the sustainability of the capitalist system in Hong Kong under the rule of the socialist motherland. This paper is an intra-cultural and inter-regional comparative study of the curricula of two systems (socialist and capitalist) under one country, using the junior secondary History curricula in Shanghai and Hong Kong as a case study. In addition to tracing the differences and similarities, divergences and convergences in the junior secondary History curricula of the two systems, the paper also generates proposals for the future improvement of History education in both cities. [Copyright of Comparative Education is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/0305006042000274836]