The observations of the increasing greenhouse gases driving the global warming over the past century shows that the warming will continue in the future.In this study,the trend of sea surface temperature (SST)over offshore China in the 21 st century is assessed based on the fifth phase of the Coupled Model Inter Comparison Pro-ject (CMIP5).The results show that under the midrange mitigation emissions scenario (RCP4.5),SST over most of offshore China will increase by nearly 1 ℃around the year 2030 relative to the historical period (1 970 ~2005). SST in the middle and high latitudes sea areas will rise faster than that of low latitude.Specifically,the East China Seas (including Bohai sea,Yellow sea and East China sea)will increase by about 1 ℃,2℃,and 3℃ between the period 2030 ~2039,2060 ~2069,and 2090 ~2099,respectively,the magnitude of which are larger than that in the South China Sea.Under the doubled CO2 emissions scenario (RCP8.5),the Bohai sea SST will rise up by a-bout 5℃ by the end of the 21 st century,and it will be the biggest warming areas in the world.These changes will pose serious risks to marine ecosystems and society on and around offshore China.It is an impress issue to curb the greenhouse gas discharge and bring down the risks of climatic changes.%观测事实表明，近百年来全球气候经历了显著的变暖过程，并且在人类活动排放的 CO2等温室气体不断增加的前提下，未来变暖将会持续下去．利用 IPCC 第五次评估报告中34个 CMIP5模式对于未来不同 CO2排放情景下的输出结果，评估了未来百年中国近海海表温度（SST）的变化趋势．结果表明，基于当前人类的 CO2典型排放速度（RCP4.5），中国近海的大部分海区在2030年以后普遍升温并将接近或超过1℃（相对于1970～2005年的历史海温）．其中，中高纬度海区的升温速率最为明显，黄海、渤海和东海的增温幅度明显高于南海，在2030～2039、2060～2069年和2090～2099年间的升温将会分别超过1、2℃和3℃左右．在 CO2加倍排放的情景下（RCP8.5），渤海在21世纪末最大升温可能接近5℃，从而成为全球升温幅度最大的区域之一．由此可见，未来气候变暖背景下中国近海的环境生态将面临严重挑战，这也使得控制减少温室气体的排放、降低气候变化的风险成为当前的紧迫议题．
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