This book is concerned how to apply behavioral economy method to predict consumer behavior. This book divides two parts, first part introduce what is behavioral economy asn second part explains how environment influences consumer behavior. In Behavioral economics part , it can provide more realistic psychological foundations. This book is intended to explain why consumer behaviors and economy has close relationship and apply economic concept to explain how the consumer chooses to do whose consumption of decision.In part one, it shall indicate how the process of behaviour economic field develops, then I shall show what methods are used to measure behavioural economy. Next, I shall indicate what the main two categories of behavioural economy are as well as I shall explain what risky and uncertain outcomes of individual behavior economic theories are as well as what behavioral game theory is. Finally, I shall explain how policy makers or decision makers can apply behavioral economy concept to do whose policy decision as well as I shall also indicate why behavioral economy and psychology which has close relationship to influence consumption of decision. In part two, environment and consumer behavior relationship, I shall explain what psychological method means and how to apply psychological method to predict consumer behavior.