This present study mainly explored the curriculum articulation in primary to secondary social studies textbooks. The approach of content analysis was adopted to examine the two units “Prehistoric Culture and Aboriginal Culture” in the textbooks of primary schools in 2007 and of secondary schools in 2008, published by H publisher.The study first involved a qualitative analysis to clarify whether the curriculum criteria and principles were met in the textbooks. Second, researchers analyzed the proportion of repetition in graphs by the quantitative method. Finally, the conclusions were provided as follows: (1) The content of the text: Most subjects in the secondary textbooks are based on primary textbooks and meetthe curriculum criteria and principles. There are two subjects in secondary textbooks, The Ruins of Prehistoric Culture and The Social Organizations of Aborigines, which are similar to primary textbooks without any expansion, and so don’t meet the curriculum criteria. Furthermore, Life Art of Aborigines is presented in primary schools, but is absent in secondary schools. The curriculum articulation should be improved. (2) The presentation of graphs: There are two graphs that are repeated, but the others are different and show the major concepts meeting the curriculum criteria and principles.Thereafter, based on the conclusions, researchers provided suggestions to a review committee for textbooks, textbook editors, publishers, and school teachers.