Heavy metal concentration as well as chemical composition were surveyed in commercial liquid pig manure to provide the basic information for mitigation research of hazardous material to agro-product. Seventy-five samples of liquid pig manure were collected and analyzed from 2009 to 2010 nationwide. Average contents of T-N, P₂O<SUB>5</SUB>, and K₂O were 0.29%, 0.08%, and 0.11%, respectively. The contents of heavy metals ranged from 0.001~0.083 for As, 0.001~0.108 for Cd, 0.002~0.495 for Cr, 0.07~47.8 for Cu, ND~0.005 for Hg, 0.035~1.033 for Ni, ND~0.291 for Pb, and 0.75~342.4 mg L<SUP>-1</SUP> for Zn, respectively. It was noted that among 75 samples, only four samples exceeded the Zn guideline (130 mg L<SUP>-1</SUP>) of liquid fertilizer derived from livestock manure but others were not exceeded the regulation.