Abstract: In this study, an AG-like gene SnAGL47 was screened by transcriptome data and bioinformatics analysis was performed. RT-PCR was used to analyze its tissue specificity in different parts, its phenotypic changes were analyzed by overexpressing SnAGL47 in S. nigrum, and the anthocyanin content of transgenic plant sepals was measured by spectrophotometer. The results showed that the Open Reading Frame（ORF） of SnAGL47 gene was 681 bp, encoding 226 amino acids, containing MADS domain and K-box domain, with two AG-motif structures at the C-terminal, belonging to AG-Like MADS-box family genes; phylogenetic tree analysis showed that SnAGL 47 was most closely related to TOMATO AGAMOUS-Like 11（TAGL11） in S. lycopersicum. RT-PCR analysis showed that SnAGL47 gene was only expressed in the carpel tissue of flowers. Morphological analysis showed that the calyx of the plants overexpressing SnAGL47 was significantly enlarged; at the fruit ripening stage, the sepals become purplish red similar to the anthocyanin accumulation in the mature fruit. In conclusion, SnAGL47 had MADS and K-box domains and belonged to AG-Like MADS-box family genes. Overexpression of SnAGL 47 can lead to the transformation of sepals to carpel-like organs and the accumulation of anthocyanins, and it was speculated that SnAGL47 was involved in the development of S. nigrum carpel and fruit ripening.