This research aims to find out how P5 learning is implemented towards the mutual cooperation dimension of elementary school students through Biopori project activities. The subjects in this research were 5th grade students at Kenteng State Elementary School, Banyuurip District, Purworejo Regency. The method used in this research is descriptive qualitative. Data collection techniques are observation, interviews and documentation. Data analysis refers to Miles and Huberman's data analysis, namely through the stages of data collection, data reduction, data presentation, and drawing conclusions. The results of the research show that the implementation of P5 learning towards the mutual cooperation dimension of elementary school students through the Biopori project carried out in class 5 of Kenteng State Elementary School is in accordance with the ideal project activity guidelines. Through these project activities, students really get meaningful learning as is the aim of P5 learning. Students not only gain knowledge but also gain skills and attitudes which are reflected in the realization of the mutual cooperation dimension when carrying out biopori project activities. The results of the biopores made by the students are also in accordance with the procedures.