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The purpose of this study was to produce Teaching Materials for secondary teachers based on 21st century skills aspecially for circle topic and to know the quality of teaching materials based on validity and practicability. This research is a development research that includes seven main steps, namely: needs analysis, the ability of researchers as developers, product design, product concepts, development, expert testing, and field trials. The feasibility of developing a teaching materials was obtained based on data from the questionnaire which was then analyzed descriptively quantitatively. The conclusion of this research is the teaching material for secondary teacher aspesially for circle topic based on 21st century skill fulfilling the minimum criteria and expressed very well from the validity aspects and in terms of practical aspects stated practical. Thus, the teaching materials for mathematics teachers based on 21st century skill can be used as a teachers guide on the learning process.