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Purposes of the study were to analyze the validity, practicality and effectiveness of learning devices using discovery learning model based on Aceh culture and to analyze the improvement understanding of students physics concept. This study was Research and Development (R&D) by using 4-D model include define, design, develop, and disseminate stages proposed by Thiagarajan with limited trial. Learning devices were developed in the form of lesson plan, student worksheet, student’s book, teacher’s book and instrument understanding of student physic concept on kinematics motion straight material. All of the learning devices were based on Aceh Culture. Subjects in this study were students of class X MIA I MA Ulumul Quran Langsa. The result of the research shows that the learning devices using discovery learning model based on Aceh culture with an average total validity of lesson plan = 4.31, student’s book = 4.36, teacher’s book = 4.39, student worksheet = 4.37 and concept comprehension test instruments valid, practical and effective and understanding of students physics concepts increases with an average N-gain of 0.35 with moderate qualifications. Keywords— development, learning devices, discovery learning, Aceh culture, understanding of students' physics concept.

Development of Learning Devices Using Discovery Model Based on Aceh Culture to Improve Understanding of Student Physics Concept