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The aim of this study was to design a STEM project-based curriculum model in primary school based on synthesis method. The statistical population included all valid scientific researches related to the subject that by regular searches in databases and based on inclusion and exclusion criteria 67 researches were selected for final review. A researcher-designed worksheet form was used to collect, record and report the initial research data. Findings were analyzed using Hurd (1983) seven-step model and open and axial coding method. To confirm the reliability, the Cohen's kappa coefficient formula was used, which was 79% of the agreement between the evaluators. Research findings show that the STEM project-based curriculum is a student-centered curriculum that defines a completely different role from the traditional curriculum elements in all curriculum elements.