The main cause of monsoon is the different in temperature between continent and ocean.Global warming could modify this pattern of temperature difference, which may have effect on Southeast Asian winter monsoon.The important characteristic of the winter monsoon is cold surge.This research analyzes the cold surge over Southeast Asia under climate change scenarios.The data for present climate are from the European Center for Medium Range Weather Forecasts (ECMWF) and the Thai Meteorological Department.The analyses of the impact of global warming are based on the data from the prediction of the climate model Bjerknes Centre for Climate Research (BCCR) Bergen Climate Model (BCM) Version 2.0 (BCCM-BCR2.0).