Abstract: In order to ensure the quality and safety of crops in the crayfish-rice planting mode and the good soil environment in the producing area, detection techniques for eight heavy metals such as chromium, nickel, copper, zinc, arsenic, cadmium, lead and mercury in soil and rice crom Hubei Province were established by Atomic Fluorescence Spectrometry （AFS） and Inductively Coupled Plasma Mass Spectrometry （ICP-MS） to determine their content and the risk assessment of heavy metals in soil and rice was made using single factor index method, Nemero comprehensive cumulative index method and potential ecological risk index method. The results showed that the content of heavy metals in the three paddy soils was less than the soil pollution screening value specified in the national standard GB 15618—2018. The single factor index method and the Nemero comprehensive cumulative index method showed that all three rice fields were not polluted by heavy metals. The potential ecological pollution level of the three paddy fields was a slight risk according to the ecological risk assessment of soil heavy metal;compared with other elements, heavy metals As and Cd had higher risks of soil pollution and ecological pollution; Pb in part of the rice produced by conventional rice fields and 2 years of shrimp and rice fields exceeded the national limit standard, and the remaining samples were in accordance with national standards. The single factor pollution index Pi of heavy metal Pb in the three paddy fields was the largest, indicating that Pb was the main pollution factor of heavy metal pollution in rice. Overall, the soil environment in the study area was good, the heavy metal content was in line with national standards, and the pollution risk was small.

Key words: raising crayfish in the paddy field, risk assessment, heavy metals, soil, rice