In the last five years, the impact of tourism on the environment and climate, especially energy consumption and CO_2 emissions(ECCE),has attracted the attention of international organizations in pace with rapid development of the tourism industry. In general, estimations on ECCE have divided the tourism industry into transportation,accommodation and activities. Tourism is the pillar industry for the national economy and the dominant part of service sector in Haikou. As the scale keeps increasing, both stock and increment of ECCE in Haikou s tourism sector has undergone significant growth. Here, a bottom-up approach was applied to determine the amount of ECCE from transport and accommodation of Haikou in 2011. Key parameters such as ECCE intensity were almost consistent with the reality in China and Haikou. We found that tourism may have consumed approximately 28.11 PJ of direct energy in 2011, which corresponds to about 22.67% of total energy consumption in Haikou. It is estimated that CO_2 emissions from tourism amounted to 2.12 Mt. The results show that tourism is an important energy-use industry in Haikou. Given climate change,energy-use savings and CO_2 emission reduction,the local government should propose effective strategies to let tourists stay at Haikou longer and reduce the frequency that tourists transfer between places of origin and Haikou. In view of the application of contract energy management,the system of energy statistics and energy audits should be established quickly. Environment taxes and ecological compensation for Haikou tourism should be considered in the future.