AS/RS technology selection is a critical issue for production companies. This process usually involves intangible criteria to consider them under vague and imprecise environment. As a new extension of ordinary fuzzy sets, Pythagorean fuzzy sets (PFSs) are characterized by a membership degree and a non-membership degree satisfying the condition that their squared sum is equal to or less than 1. COmbinative Distance-based Assessment (CODAS) method is relatively a new multi criteria decision making (MCDM) technique in the literature. We modify the CODAS method by making a new distance measurement definition. The aim of this paper is to apply the modified Pythagorean fuzzy extension of CODAS method for the selection of the best AS/RS technology.