In order to know the physical and chemical properties of protected vegetable soil,water content,total N,P,K and heavy metal content in the protected vegetable soil were studied in the north of Jiangsu province with the different years of cultivation(1,3,5,7 years).The results showed that water content significantly decreased with the increase of the cultivation time and soil depth.Total N,P and K contents in the protected vegetable soil were higher than the field soil,especially total N and total K contents...