Countries have strengthened the liberalization of trade up to a point as a result of some negotiations with General Agreement on Tariffs and Trade (GATT) and World Trade Organization (WTO), and one consequence of the commitments they have made with these institutions is a reduction in customs duties. However, this situation is not at all as it seems, because on the one hand, while customs duties were reduced in line with the commitments before WTO, on the other hand, the number of applied Non-Tariff Measures (NTMs) were increased. Today, NTMs constitute a significant part of trade costs. One of the most effective tools used to predict the effects of the NTMs on trade flows is the Gravity Model, and it is widely used to predict the effects of the NTMs. For the stated reasons, the main purpose of this study is to discuss the methods used in analyzing the NTMs by showing how the Gravity Model affects the trade flow in the light of recent developments in the literature and to provide various suggestions on how to conduct a trade policy analysis.