Based on field experiment in sunlight greenhouse on Loess Plateau, this paper dealt with the continuous cropping obstacle of cucumber. The results showed that, as continuous cropping years increasing, soil main fertility index increased, but the ratio of N, P and K was not rationale. As continuous cropping years increasing, soil bacteria and epiphyte quantity increased obviously, but fugue not increased, cucumber main disease become serious. There were significant difference in growth characteristics and productivity in continuous cropping years.