A risk assessment on the heavy metals including arsenic (As), cupper (Cu), lead (Pb), and zinc (Zn) was investigated bysetting exposure routes in agricultural fields. Moreover, the factors requiring improvement in risk assessment were alsodiscussed through a review of the dermal absorption slope factor (SFabs) and total amount of suspended particles (TSP) inthe current risk assessment guidelines. Assessment results show that the total cancer risk (TCR) of As through crop andsoil ingestion was 1.51E-03 in adults and 6.37E-4 in children, which indicated a carcinogenic risk (exceeding 1E-05). Onthe other side, the harzard index (HI) was 3.37 in adults and 1.41 in children, which was evaluated as having a noncarcinogenicrisk (>1). The carcinogenic purification targets for As were calculated to be 6.84 mg/kg in adults and 6.86mg/kg in children, while the non-carcinogenic purification targets were calculated to be 13.43 mg/kg for adults and 22.54mg/kg for children. When applying SFabs 61 of the current guidelines, it appears that there is a carcinogenic risk eventhough the As exposure concentration is below the area of concern 1 standard (25 mg/kg), which suggestes that additionalresearch on this factor is required for the risk assessment. In order to apply the measured suspended pa...