To do agrometeorological servicework, the basic situation, characteristics ofclimate, meteorologicaldisasterand condition of occurrence ofpests, ecology characteristics ofplant, and crop ecological climate adaptability should be known. We should also do serviceworkwith flexible forms and have service productswith strong pointand strengthen the fourbasic constructions and four system construction work.

Aiming at the frequent strong convectiverweather and exceptionalmore precipitation over InnerMongolmain landing field of Shenzhou No. 7 Space Ship in August and September2008, the climate background and the large-scale circulation featurewere analyzed based on NCEP 1°×1°reanalysis data. Result indicated that the sea surface temperature (SST) overWestern Tropical Pacific  from July 2007 to February 2008 was lower and snow coveroverEurasia andQinghai-TibetPlateauwas bigger in the precedingwinter and spring. The polar vortex centre was located at theWesternHemisphere in August and EasternHemisphere in September, which was themain reason why there was exceptionaly more precipitation in the preceding stage and higher temperature in the succeeding stage over themain landing field. The strongmeridional circulation overEurasiawas beneficial to the cold and warm air convergence.The stronger and westSubtropicHigh and the active India-Burma trough provided the abundantwatervapor and fluctuation energy for convective activity over themain landing area. The southerly and northerlywind atmid-low levels encountered and maintained over the north ofHuaihe River, whichwas themain reason formore precipitation andmore convective activity over themain landing field in August and September 2008.