Abstract: In order to assess the accumulation of major heavy metals in edible parts of vegetable and their transfer in soils at different depths， the present study was carried out in a broccolisword bean continue cropping system by application of chemical fertilizer （CK） and different amounts of chicken manure based organic fertilizer （T1， 3.75 t·hm-2; T2， 7.50 t·hm-2; T3， 15.00 t·hm-2）. It was shown that the application of organic fertilizer had no significant effect on the content of Pb， Cr， As， Hg， Cd in the edible parts of broccoli. However， the content of As and Pb in sword bean was significantly increased under T3 treatment. After longterm application of organic fertilizers， the accumulated Cu， Zn， Pb， Cr and As were mainly distributed in the 0-20 cm soil layer. On the whole， the soil samples collected at the harvest time of sword exhibited a higher content of heavy metals than those collected at the harvest time of broccoli. Cu showed the highest content in the samples， and was followed by Zn， Pb and then Cr and As. Organic fertilizer application mainly affected the content of Cu， Zn and Pb in topsoil （0-20 cm）， but also resulted in an increase of Zn in 20-40 cm soil layer as well as an increase of Cu in 40-60 cm soil layer. There was no obvious increase of As and Cr content in topsoil （0-20 cm）. Organic fertilizer application not only increased As content in topsoil （0-20 cm）， but also increased Cr content both in 0-20 cm and 40-60 cm soil layers. Overall， continuous application of organic fertilizer at a high level elevated the risk of heavy metal pollution in vegetable lands.

Key words: organic fertilizer, soil, heavy metal, vegetable continuous cropping