Abstract: The cropping systems of cucumber and other different crops which were conducted in plastic greenhouse on Loess Plateau were studied. The results show that after cucumber harvest, there is significant effects of different cropping systems on soil microbe, the soil microbe is the lowest in follow, the second lower is planting cowpea or other legumina crops. The highest cucumber yield can be got after planting corn for green manure, black-bean for green manure or planting cowpea, then higher cucumber yield can be got after follow, the cucumber yield is the lowest after planting tomato, cabbage. It is efficient rotation system for overcoming continuous cropping obstacle to use rotation system of cucumber with corn for green manure, black-bean for green manure or planting cowpea.