Agriculture receives an attention on its role in mitigating greenhouse gases (GHGs) by emission reduction and enhanced carbon sequestration in agricultural land. There is a possibility for incorporating agricultural sector as a GHG mitigation option in post-2012 agreement, but several aspects need to be considered before implementation. Hence, GHG mitigation in the agricultural sector is under discussion in the AWG-LCA. This report aims to (1) summarize the discussions related to agricultural sector in the negotiation forum and (2) preliminarily assess their potential impacts to Thailand, by gathering the negotiating texts and other relevant documents. The main aspects of the AWG-LCA discussion on agricultural mitigation are composed of methodology, policy and measure, and financial incentive. Due to an agricultural-based country, these discussion aspects on agriculture may have several impacts to Thailand, such as environmental impact and socio-economic impact, as are stated in this report. As a result, Thailand should establish nationally appropriate mitigation plan and measure for agriculture in order to receive prompt and ultimate benefits when participating in agricultural GHG mitigation options. This report also discusses and purposes the relevant research issues on the agricultural mitigation options. Due to the adverse effect of climate change on agriculture, Thailand should prepare national adaptation plan to gain an effective cooperation and support from the relevant adaptation mechanisms.