Spring wheat growth and meteorological condition observational data for a semi-arid region of the Loess Plateau were used to analyze the effects of climatic change on spring wheat growth and the relationship between spring wheat growth and meteorological conditions. The results showed that precipitation displays a descending trend, and changes at a velocity of -15.796mm/10a. In addition, an annual periodic change of 3a and 6a was observed. The temperature displayed an ascending trend and changed at a rate of 0.362℃/10a. The aridity index displayed a marked ascending trend and changed at a velocity of 0.12/10a. The aridification tendency was significant from the beginning of the 1990s to 2009. The whole growth period of spring wheat takes110-130days, during which1500-2000℃ in temperatune ( all of which should be above 0℃ ) should be accumulated , 150-200mm precipitation and 800-1300h sunshine duration are required. The results also showed that the dried weight growing velocity became much greater on day 38 after sowing and then decreased on day 63 after sowing. The highest velocity appeared on day 50 after sowing. The interval between the milky stage and maturation displayed a decreasing trend, and changed at a velocity of -2.874d/10a, that is ,it would be shortened by 2-3days /10a. The interval between the milky stage and maturation was significantly negatively correlated with the average temperature in June and July, and the entire growth period displays a decreasing trend on an annual basis, changing at -4.117days/10a, that is, it would be shortened by 4-5days/10a. The entire growth period was signi ficantly correlated with the average temperature from April to July. That is, it would be shortened when the average temperature was ascending. The entire growth period was significantly positively correlated with precipitation during this period; therefore, it would be extended when the precipitation increased. Except for the sowing-seeding stage and the maturation stage, the temperature was negatively correlated with the yield. The boot stage yield was very sensitive to temperature and the sensitive period was about 40-45d; therefore, the yield will decrease 15-18 g/m² when the ten-day period average temperature increases by 1 ℃ because of climate warming. The influences of precipitation and temperature are distributed in an in-phase opposition. Except during the seeding stage and maturation stage, the precipitation is positively correlated with the yield, and the yield is very sensitive to precipitation during the jointing and earring stages. The sensitive period is about 50-60d, and the yield will decrease 14-20 g/m² when the ten-day period precipitation increases by 1 mm. Sunshine hours were positively correlated with the yield in the sowing stage and the maturation stage. The impacts of meteorological factors on spring wheat growth showed an ascending trend, although the yield decreased significantly in 1995a, 1997a and 2007a because of the significant decrease in precipitation that occurred in these periods.