Reviews the origin of ASEAN Economic Community (AEC), and the mechanisms of ASEAN operation, particularly on economy. Describes the evolution of ASEAN economic cooperation from ASEAN Free Trade Area (AFTA) to AEC, including the essence, agreement, measure, vision, mission and objective of AFTA, import tariff reduction, and goods on the sensitive and highly sensitive lists. Studies the vision, mission, objective, agreement and measure of AEC, the impact of AEC on the member countries, the AEC Blueprint, and cooperation frameworks between ASEAN and important non-member countries. Examines the essence, agreement and measure of other important trade cooperation, such as the European Union and the North American Free Trade Agreement (NAFTA). Investigates the impact of AEC on Thailand, covering the position of Thai goods, and positive and negative impacts. Suggests active approaches for Thai entrepreneurs, looking at the survey result on the opinion of SME entrepreneurs in the sectors affected. Presents problems and obstacles of Thailand and neighboring countries, providing guidelines for development with 2015.Summarizes the impacts on the main fifteen industries and suggestions for the government.