Project teaching is an active teaching method, helping elementary school students develop the ability to apply the knowledge and skills they have learned. In Grade 4 Science, applying the project teaching method helps make teaching and learning highly effective. This article has proposed a process for organizing the teaching of learning projects in science subject grade 4 in elementary schools. Consists of three phases: preparation phase, project implementation phase and results reporting phase. The article provides an example illustrating the content of the learning project “Nutrition needs of the body” to help students learn about some diseases related to nutrition in the topic People and health.