Using the data of World Data Center for Greenhouse Gases (WDCGG) and WMO, the concentrations of the main greenhouse gas CO2 in China and its surrounding countries and regions are preliminarily analyzed. The results show that: the CO2 concentrations in China mainland are close to Hong Kong in China, Japan, Russia, and South Korea; they all have the same trends. Higher CO2 concentrations are found in Hong Kong in China and South Korea, while lower CO2 concentrations in Japan, Russia, Waliguan in China. The results of many years observation show that the average concentration of CO2 in the northern hemisphere is increasing year by year, and the average annual variation of CO2 concentration is inversely proportional to the altitude of the observation station. The concentration and variation trend of CO2 in Waliguan Global Station is consistent with that in the Mauna Loa, Barrow, Trinidad Head global station. But the annual variation in Waliguan is slightly higher than in Mauna Loa, and lower than in Barrow. The changes of CO2 concentration in Shangdianzi Regional Background Station in China are more violent than in Waliguan, Mauna Loa, Barrow, Trinidad Head Stations, which shows that Shangdianzi Station is affected by the stronger regional emissions.