This study aims to produce a valid hypothetical learning trajectory (HLT) for class X senior high school on the topic of trigonometric ratios. The developed HLT based on contextual teaching and learning with Melayu Riau nuences. HLT is developed by combining two types of design research, namely the Plomp model dan the Gravemeijer and Cobb model. Based on the combination of the two models, the stages of this research consist of : (1) the initial investigations stages, (2) the development or prototyping stage, and (3) the assessment stage. The focus of this research is validity by expert in stage of protoype development. Aspects that are assessed at the validation stage are content aspects, graphic aspects, and language aspects. The average value of HLT validation by experts is 3,41 and is in the valid category.
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