Description:Brown fat was well known as its thermogenesis function, however, many studies started to report its endocrinology role in metabolic regulation. There are no suitable systems can be use to study the circulating batokines derived from BAT. Here, we created a BAT ablation mouse model which lost most BAT in vivo. We screened the BAT- responsive circulating lipokins using this model. In conjunction with other lipid atlases, including mice tissues, BAT explant media, BAT extracellular fluid, BAT cell media, we identified the hydroxy fatty acids as the key candidate of the BAT-derived circulating lipokins. This was further validated in the human cohort with varying BAT activities. Overall, all study uncovered a BAT-derived lipokin by multidimensional lipid atlases, this lipokin was shown to control liver bioenergetics.