Abstract: In order to demonstrate the content of soil heavy metals in Liaocheng suburbs, sealed digestion method under high pressure and flame atomic absorption spectrophotometer were used to study the spatial distribution of heavy metals from different soil layers in and out of greenhouse. The results showed that soil heavy metals content gradually decreased in sequence of Fe,Mn,Cr,Cu,Cd,both in greenhouse and out of greenhouse,and content ranges were respectively 7 333.90~7 729.93,630.66~780.21,214.27~247.38,27.63~44.08,0~0.36 μg/g. At the same soil depth, heavy metal content inside of greenhouse was much higher than outside except cadmium at third soil layer and manganese at fifth soil layer. But the single factor indice of soil heavy metals pollution were all less than 1,and the single factor pollution index descended as P_Cr>P_Cu>P_Cd>P_Fe>P_Mn. The risk of soil heavy metal pollution in Liaocheng suburb was lower than standard, which showed that the soil was safe in crop cultivation.

Key words: greenhouse, soil heavy metals, pollution index, spatial distribution