This paper studies the effect of improvement in trade facilitation according to ASEAN Economic Community (AEC) on cross-border freight and trans-border trade. To this end, field surveys were conducted at six strategic border checkpoints for cross-border transportation. These include 1) Aranyaprathet checkpoint, Sa Kaew; 2) Mukdahan checkpoint, Mukdahan; 3) Nakhon Panom checkpoint, Nakhon Panom; 4) 1st Thai-Lao Friendship Bridge, Nong Kai; 5) Sadao, Song Khla; and 6) Padang Besar, Song Khla. At each checkpoint, several primary and secondary data regarding cross-border procedures, efficiency, service satisfaction, future improvement plans for AEC, etc were collected. Then, the economic models were created to evaluate how the improvement in trade facilitation according to AEC in 2015 would affect trade values in each individual checkpoint. Lastly, the recommendations to support more efficient cross-border trade for Thailand’s export goods were developed. The findings show that the implementation of ASEAN Framework Agreement on the facilitation of goods in transit and inter-state transit will improve the export values at the border locations of Thailand. If only ASEAN Single Window Inspection is implemented, the exports passing all border locations of Thailand will increase 308.88 million baths. If the EDI system is installed in all neiboring countries, an increase in exports will be 723.97 million baths. Furthermore, if the CLM countries can reduce the time used in their custom procedures for one hour, the export values at all border locations of Thailand will rise by 1,029.33 million baths without the implementation of EDI system in the mentioned countries and 4,109.92 million baths with the implementation of EDI system. The findings from field survey show that existing designs of trade facilitation infrastructure at each border checkpoint are inefficient. They would be designed according to user’s types, volumes, and demands. Furthermore, the logistics activities at the border would be separated from tourist and urban activities for smoother operations. It was found that Thai operating officers at the border do not have collaborated with neighboring countries’ officers well resulting in operational problems. This could be one of main obstacles once AEC agreements become effective.