Based on the measurement of the heavy metal Pb and Cd seasonal content in the surface dust by ICP-MS in the culture and education district in Xi'an City

the article analyzed its pollution characteristics using the classification of geological cumulative pollution index

evaluated the health risks with the health risk evaluation method.The result showed that the content of the heavy metal Pb and Cd content in the surface dust exceeded its soil background value of the Shaanxi Province and most of the geological cumulative index was smaller than 1

which belonged to the slight pollution while the pollution in winter was more serious than the other seasons

of which the contents of the metal Pb and Cd were higher in the eastern suburb while equal in the rest southern

western and northern suburbs.Among three isotopes of Pb and Cd

the content of 207Pb and 112Cd were the highest. The average daily exposure intake of Pb and Cd was through mouth by mistake

and intake of Cd was more harmful than Pb.