| The study based on the stratiform cloud data obtained by PMS, thermo-hydrobarograph and GPS orientation system that hold on manpower add rain plane, combining the general observation data of ground secondary planet and radar and so on. Synthesized analyzed the macro-micro physics structure of stratiform cloud such as particle level and vertical distributing and particle structure in different region around season, altostratus and stratiform cloud of has precipitation potential especially. Opening out the precipitation efficiency of stratiform cloud in Gansu and evaluating the rainfall potential,The main conclusion is as follows:1. Combining the Gansu province practical circs, designed the plane exploring experimentation scheme in scientific,optimize designed the weather modification catalysed task,horizontal exploring airline,vertical exploring airline and the airlines of contrasted observation, ensuring exploring experimentation scheme in reason and collect the count data.2. Explored the precipitation stratiform cloud in Hexi region of Gansu on Oct.12 in 2001. Analyzing the partical ice-snow crysta characteristic of precipitation stratiform cloud. Provided the distributing characteristic of all kinds of partical and the ice-snow crystal spectrum in different temperature, analyzed the change characteristic of partical spectrurn with temperature and its micro-physics mechanism. Compared the ice and snow crystal consistency with the other area in China, in stated precipitation stratiform cloud conditions, stratiform cloud have more add rain catalyze potential on autumn in Gansu province.3. Using the vertical exploring datums of stratiform cloud in Zhong chuan aerodrome on Sept. and Oct. 12 in 2001. Analyzed the temperature of Cs-As-Ns and Ac-Sc stratiform cloud, cloud particle consistency,cloud particle diameter,the content of liquid water and the vertical distributions characteristic of cloud particle spectra, simulated the distributions of cloud particle spectra by N rankΓfunction, select the optimum parameters of simulated spectral function, and point out the location of the inversion temperature layers relative to 0℃layers and the remarkable effect of inversion temperature strong or not on the micro-physical characteristics distributions and form precipitation。4. Analyzed the level changes and vertical distributions characteristic of the cloud drop and ice crystal micro-physics value in the cold front weather process on Apr. 28 in 2002. Confirmed the optimum parameters of simulated spectral, opening out micro-physics process has generant. Explained some characteristic of stratiform, cloud in the cold front weather process in Gansu from microcosmic point of view, discussed the potential of cloud system add rain. 5. Explored the precipitational cloud in the Longdong region of Gansu on Sept. 12 in 2002,analysed the macro-micro physics structure characteristic of precipitational stratiform cloud and the level and the vertical distributions of differ scale cloud particle,discussed the distributions of corresponding spectral and the precipitation efficiency of different cloud system combined the weather and the satellite cloud image of the corresponding period in this region on autumn.The result show that the high and middle clouds may coexistence and have the precipitation mechanism of "seed-provide increase", the cloud drops consistency, liquid water content and average diameter on the small side. Possess preferably catalyse potential if the rain drops consistency of small,relatively scale of greatness and precipitation efficiency of low in this region.6. Based on a airplane task data in autumn, combined the weather and the satellite data in the same term, analysed the structure of cold stratiform cloud and evaluated the seedable. The result show that 75 percent of period of time work in strong seedable region and the other time in unseedable region.The low precipitation efficiency cloud have preferably catalyse potential.
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