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The bile acid sodium symporter (BASS) family plays an important role in transporting substances and coordinating plants’ salt tolerance. However, the function of <i>BASS</i> in <i>Brassica rapa</i> has not yet been elucidated. In this study, eight <i>BrBASS</i> genes distributed on five chromosomes were identified that belonged to four subfamilies. Expression profile analysis showed that <i>BrBASS7</i> was highly expressed in roots, whereas <i>BrBASS4</i> was highly expressed in flowers. The promoter element analysis also identified several typical homeopathic elements involved in abiotic stress tolerance and stress-related hormonal responses. Notably, under salt stress, the expression of <i>BrBASS2</i> was significantly upregulated; under osmotic stress, that of <i>BrBASS4</i> increased and then decreased; and under cold stress, that of <i>BrBASS7</i> generally declined. The protein–protein interaction analysis revealed that the <i>BrBASS2</i> homologous gene <i>AtBASS2</i> interacted with Nhd1 (N-mediated heading date-1) to alleviate salt stress in plants, while the <i>BrBASS4</i> homologous gene <i>AtBASS3</i> interacted with BLOS1 (biogenesis of lysosome-related organelles complex 1 subunit 1) via co-regulation with SNX1 (sorting nexin 1) to mitigate an unfavorable growing environment for roots. Further, Bra-miR396 (Bra-microRNA396) targeting <i>BrBASS4</i> and <i>BrBASS7</i> played a role in the plant response to osmotic and cold stress conditions, respectively. This research demonstrates that <i>BrBASS2, BrBASS4</i>, and <i>BrBASS7</i> harbor great potential for regulating abiotic stresses. The findings will help advance the study of the functions of the <i>BrBASS</i> gene family.