Abstract: The dynamics of soil microbe and nutrient of strawberry under protected cultivation with different preceding crops were studied at three stages, and the economic benefits were also analyzed. The results showed that the number of Fusarium and fungi in soil were improved by 22.2% and 21.6% respectively with melon preceded, and soil available P, available K and organic matter were consumed more with watermelon preceded. Except the treatment of idle greenhouse, all rotation modes reduced the ratio of B/F significantly, and soil fertility was reduced. Preceding rice not only significantly decreased the number of soil Fusarium and fungi by 82.6% and 76.0% respectively, but also improved strawberry yield and rate of big fruit than other treatments. The net income brought by preceding rice mode was higher than melons rotation mode by 11.1%. Apparently, the strawberryrice rotation mode can make the topmost comprehensive benefits．

Key words: preceding crop, strawberry, soil environment, economy benefit