The mechanism for the reaction of the HS radical with fulminic acid (HCNO) to gain OH, NH2, HCN, H2O, CS and HNO has been investigated at the B3LYP/6-311 ++G(3df,2p) level of theory. The potential energy surface (PES) for this system shows that there are eight different product pathways: PR1 (SCO +NH2), PR2 (HSCN + OH), PR3 (SCN + H2O), PR4 (CS + NHOH), PR5 (SCNH + OH), PR6 (HCS + HNO), PR7 (CS + NH2O) and PR8 (HCN + HSO). The results indicate that PR2 (HSCN + OH), PR3 (SCN + H2O) are the major product channels with minor contributions from PR4 (CS + NHOH), PR5 (SCNH + OH), and PR8 (HCN + HSO) whereas the other channels for PR1 (SCO +NH2°), PR6 (HCS + HNO), PR7 (CS + NH2O) are less favorable.