Abstract: Based on the better ecological effect but lower crop yield under no-tillage in Ecotone of north China, the changes of soil temperature under no-tillage and plow tillage were contrastively analyzed to find out the factors that affect the crop growth. Results show that the change of soil temperature is slower and less under no-tillage than that under plow tillage. In daytime, the soil temperature is higher under plow tillage than that under no tillage. The soil temperature in vertical section descends with the soil depth. The change trend within one day is significant. There exists positive correlativity between soil temperature and air temperature, and the correlation coefficient is over 0.5. The regressive relationship is more significant under plow tillage than that under no-tillage. Effected by soil temperature and the other physical properties, the biomass and yield are less under no-tillage than that under plow tillage. Therefore, soil physical properties should be ameliorated by the agricultural measurement to improve the crop yield in Ectone of North China.