The paddy soil and Rice in the south of Tangshan were studied to determine the contents of Cr，Cd，Pb，As and Hg，and the methods of the single factor index，the Nemerow comprehensive index and the potential risk index were used to the evaluate pollution status and ecological risk of paddy soil in the study area. Results showed that: The average value of the contents of Cr，Cd，Pb，As and Hg in paddy soil was higher than the background value of heavy metals in soil of Hebei Province，and Cd and Hg pollution are the most prominent problems. The contents of Cr，Cd，Pb，As and Hg in rice was lower than the National Standard limit value of food safety,indicating the rice eaten by the local people is not a threat to their health. On the general，the soil in the study area was slightly polluted，and 25.63% was in the alert limit. Cr，Pb，As and Hg in paddy soil were at low potential ecological risk，though 2.74% of cadmium was in moderate potential ecological hazard. The average value of comprehensive potential ecological harm index of five heavy metals was 23.42，which was the level of slight ecological risk. The contribution rate of Cd to the potential ecological harm was the highest，so it is the main source of soil ecological risk in the paddy field.