Warming of the climate system in recent 100 years is unequivocal.Under global warming,the amounts of snow and ice have diminished,the sea level has risen,and the extreme weather and climate events have increased.The climate system is facing severe challenges.2020 is becoming a special year on record for the bushfires in Australia,the locust plagues and the frequently extreme weather and climate events.How about the global warming in 2020?Based on the ERA5 reanalysis data,the global annual mean surface temperature (ANNT) in 2020 (ANNT-2020) is predicted.It suggests that the anomalies of the ANNT-2020 compared to the climatology during 1981-2010 and the interannual increment of the ANNT in 2020 will both be positive,since the interannual increment of the global winter surface temperature (DJFT) appears over 0.2℃ in 2020 and the signals of the anomalies in greenhouse gases,sea ice and sea surface temperature are positive for ANNT in 2020.Using the interannual increment approach,the quantitative prediction of ANNT-2020 shows that the ANNT-2020 will most possibly exceed the ANNT-2016 and 2020 will become the warmest year on record.