This study is a part of a research to develop the elementary mathematics curriculum to enhance creative problem-solving abilities through reconstructing and specifying national mathematics curriculum. The developed mathematics curriculum is characterized as devision of conceptual knowledge and procedural knowledge, and emphasis on relationship among concepts. The explicit network among concepts and between concepts and skills in the curriculum can help children have a powerful knowledge base for divergent and critical thinking in mathematical problem solving. For the relationship among mathematical concepts, the conceptual knowledge is reconstructed on the four themes, such as algorithm, relationship, pattern and generalization, and representation, which stems from the nature of mathematics. The results of reconstruction are presented in the form of matrix, such that the vertical axis represents how the concepts within each strand of mathematics curriculum are unified, while the horizontal axis shows how the concepts across the strands are related in terms of the themes.