Based on the Chapter seven from the Sixth Assessment Report (AR6) contributed by the Intergovernmental Panel on Climate Change (IPCC) Working Group I (WGI),this study interprets the assessment of climate sensitivity from multi-source evidence,including process understanding,instrumental records,paleoclimate data,and emergent constraints.The conclusion is that this evidence gives a combined best estimate of 3 ℃ to equilibrium climate sensitivity (ECS),with a likely range of 2.5—4.0 ℃ and a very likely range of 2.0—5.0 ℃.Meanwhile,for transient climate response (TCR) the best estimate is 1.8 ℃,with a likely range of 1.4—2.2 ℃ and a very likely range of 1.2—2.4 ℃.Compared with previous IPCC reports,the most important innovations in AR6 regarding the estimation of climate sensitivity are that Earth climate system models were not considered as a line of evidence,and that the CMIP6 results were only given for comparison with the combined estimate from other evidence.The average ECS and TCR from CMIP6 were higher than those in CMIP5 and the best estimates in AR6,and the uncertainty range of ECS based on multi-source evidence was effectively narrowed compared with that based on CMIP6.