The purpose of this research was to study and compare children's collaborative behaviours through organising experiences based on the engineering design process. This research was conducted in the context of Thai early childhood classroom. The study group used in this research was 30 students from Kindergarten 3/1 Anubansamsen School (The Government Lottery Office Support) studying in the second semester of the academic year 2022 using a cluster random sampling method. The instruments used in the research were: 1) an experience plan based on the engineering design process for early childhood children; and 2) an observational form of early childhood children's collaborative behaviours. Statistics used for data analysis were mean, standard deviation, and t-test dependent. The results of the research revealed that, before organising experiences based on the engineering design process, early childhood children showed collaborative behaviours at a moderate level (M = 19.06). After the experience, the collaborative behaviours of early childhood children overall were at a very good level (M = 42.46). When comparing the collaborative behaviour scores of early childhood children, it was found that after the engineering design experience, the scores were significantly higher than before, at a statistical level of 0.01.