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This research was conducted by analyzing the learning obstacles that were found to be used as the development of learning trajectory thinking algebra. Learning trajectories are composed of systematic material about tables and diagrams for elementary schools. Problem modeling is represented through tables and diagrams from concrete to abstract levels. The process of analysis results in an alternative didactic situation that can overcome osbtacles in algebraic thinking. this study is conducted by utilizing a qualitative research with hermeneutics and phenomenology paradigms. This research was conducted by analyzing the learning obstacles that were found to be used as the development of learning trajectory for algebraic thinking. The result of this research is a learning trajectory which is a part of lesson design of algebraic thinking for elementary school.