Disturbances in lipid metabolism are at the core of several health issues facing modern society, including fatty liver and obesity. The SREBP-1 is one important transcription factor regulating lipid metabolism, but the relevant mechanism still remains unknown. The present study determined the transcriptional regulation of SREBP-1 and its target genes (including accα, fas and scd1) in a freshwater teleost, grass carp Ctenopharyngodon idella. We cloned and characterized the 1988 bp, 2043 bp, 1632 bp and 1889 bp sequences of srebp-1, accα, scd1, and fas promoters, respectively. A cluster of putative binding sites of transcription factors, such as SP, YY1, NF-Y, SREs and E-box element, were predicted on their promoter regions. nSREBP-1 overexpression reduced srebp-1 promoter activity, increased scd1 and fas promoter activity, but did not influence accα promoter activity. The site mutation and EMSA analysis indicated that srebp-1, fas and scd1 promoters, but not accα promoter, possessed SREs. In CIK cells of grass carp, nSREBP-1 overexpression significantly reduced srebp-1 mRNA expression, and up-regulated miR-29 mRNA expression. The 3’UTR of srebp-1 possessed the potential miR-29 binding site and miR-29 up-regulated the luciferase activity of srebp-1 3’UTR and srebp-1 mRNA expression, implying a self-activating loop of SREBP-1 and miR-29 in grass carp. Based on these results above, we found two novel transcriptional mechanisms for SREBP-1 in grass carp: (1) the auto-regulation sited on the SREBP-1 promoter regions was suppressive; (2) there was a self-activating loop of SREBP-1 and miR-29.