The present study, based on the promotion of social trust and social interactions, aims at providing a number of guidelines for the design of children’s open learning spaces. An exploratory research is conducted based on both qualitative-quantitative methods. At the primer part of the research which is the focus of this article a qualitative method is applied, using three rounds of Delphi. Consequently, professionals were interviewed in an unstructured way in the field of landscape architecture and social psychology. Then, with the techniques of open and axial coding the content table is created to manage questionnaires. Network sampling method (snowball) on the sample size of 10 professionals is used. The data were analyzed using Q factor analysis and four factors were recognized. The most affecting elements on the social trust in process of learning in open primary school spaces are consist of; social, design, physical spaces and environmental psychology dimensions.