Based on the data of cloud amount during 1951－2007 from seven weather stations in Tianshui，the variation of the total cloud amount and low cloud amount was analyzed，and also the relationship between cloud amount and interrelated climatic factors was discussed．The results showed that the mean total amount of cloud varied little and mean amount of low cloud increased by 0．25%every ten years since 1951．The rainy days with different rainfall level correlated well with cloud amount．It also indicated that the precipitation varied with cloud amount，the annual precipitation increased by 156 mm when annual mean cloud amount increased by 10%．
When seasonal mean cloud amount increased 10%，the precipitation increased by 25 mm，75 mm，35 mm and 3．8 mm in spring，summer，autumn and winter，respectively．When the cloud amount increased by 10%，the mean temperature in spring and summer decreased by 0．6℃and 0．5℃，but there was no correlation between cloud amount and mean temperature in winter and autumn．The sunshine hours was seriously influenced by cloud amount，when cloud amount increased by 10%，the sunshine hours decreased by 102．2 h in spring，90．8 h in summer，87．7 h in autumn and 65．3 h in winter．There was positive correlative between mean cloud amount and relative humidity，when cloud amount increased by 10%，the relative humidity increased by 4%in summer，3%in spring，autumn and winter．The days with＞80%cloud amount reduced year by year in spring．

Based on the data of Chinese PricklyAsh phenological observation and the yield during 1998 - 2007 and meteorological data
during 1961 - 2007, the main influences ofmeteorological conditions on Chinese PricklyAsh growth were analyzed and calculated with
statisticalmethod. The results indicated that the main meteorological factors about Chinese PricklyAsh in Qing’an countywere as fol
lows: the lowest temperature in winter, and temperature daily range, p recip itation, sunshine hours during the full flowering period, the
lowest temperature in the season of flower dropp ing and fruit growing, and the extremely highest temperature and p recip itation in July;
the highest temperature and average temperature in Augest. The freezing injury in early sp ring and drought in July are the main meteor
ological hazards to Chinese Prickly Ash, and their climatic frequencieswere increasing from 2000, thiswould bringmore risk and un
certain factors to Chinese PricklyAsh growth, so the variety cultivation, the soil condition, the cultivation managementmeasure should
be enhanced.

Based on the data ofwheat stripe rust observation, the meteorological data from seven weather stations and the data ofwinter wheat growth periods in different districts of Tianshui during 1994 - 2006, the characteristics ofwheat stripe rust development and the relation between meteorological factors and winterwheat growth period were analyzed with the method of statistics. The results show that the occurring area ofwinter stripe rust p resented linear increase trend after 1994 with the globalwarming. The ep idemic of stripe rust depends on both localmeteorological condition and stripe rust develop ing trend in periphery area. The model for the stripe rust forecast wasmade and this p rovide some help for active p revention of stripe rust and scientific decision of winterwheat p roduction.

Based on analysis of phenological features and metorological conditions during the growing period of prosomillet in Gansu province，the main agrometeorological facts that influence on the growth of prosomillet have been found out and discussed.The influences of meterological factors on the yield of prosomillet has been analyzed with statistical methods.The complex in dices system of ecoclimate regionalzation for planting prosomillet in Gansu province has been given，and the suitable regions have been pointed out，the fit
and unfit conditions in different regions have been commented.