Mathematics is used in all aspects of life and emphasizes the activities. This research aimed to develop based realistics mathematicalapproach in geometric transformation’subject. This research used design research to provide a good consideration of learning process through allegations built in framework analysis hypotetical learning trajectory (HLT). The HLT using Sumatera Selatan Traditionals’dancing by collecting data through documentation, interviews, and classroom observations. Design research is carried out in three stage which preparing for the experiment; the design experiment (pilot experiment & teaching). The result of this research showed local instructional theory. The result of this research indicate that the dancing  helped student understand the concept of geometric transformation. The learning trajectory for geometric transformation based on dancing is seen from the the perspective of level of emergent modelling which Situation level, gesture on dancer; Referential level where  the rules of the gesture were used as starting point to learn the concept of geometric transformation. Movemment between gesture on dancer stimulated students’knowledge about translation, reflection, rotation, and dilations; general level, students used the properties formed like describe shadow. Lastly, at the formal level students development their informal knowledge into formal concepts of geometric transformation.