Abstract: Extreme anomalous events in the southern Bay of Bengal cold pool (SBOBCP) in 2018 and 2015 were compared and analyzed based on multisource satellite remote sensing data. The SBOBCP appeared in May, reached its maximum intensity in August and September, weakened in October, and gradually disappeared. The strongest and weakest SBOBCP years occurred in 2018 and 2015 from 1993 to 2018, with anomalies of -0.55 ℃ and 0.43 ℃，respectively. The wind stress anomaly in the SBOBCP was 0.02 N/m² in 2018, and -0.01 N/m² in 2015. The Ekman pumping velocity anomaly was positive in 2018 and negative in 2015. Diagnosis suggested that advection was the main cause of the formation of the cold pool. In summer (6-8), cooling advection accounted for 49.2% and 80.7% in 2018 and 2015, respectively. June was the key period of SBOBCP's formation, and the SBOBCP cooling in June 2018 was 2.76 times of that in 2015. Meanwhile, the anomalies of the net heat flux items and advection items played an important role in the cold pool extreme events.