In this article, the sensitivity test of air-sea surface flux model was carried out by the field observation data of " South China Sea Air-Sea Flux Measurement During 2000" project.

By using the thermodynamic equilibrium model ISORROPIA and a gas phase chemistry model,the impacts of sea salt aerosol,relative humidity and temperature on the acid-base gases and the inorganic salts are investigated through sensitivity tests,and the impacts of different concentrations of sea salt on the thermodynamic equilibrium are also showed.

Two different wind stresses deriving from SODA reanalysis data were adopted to force the model,which are original stress data(called control experiment) and minishing data in(10 °S～10 °N,180 °～120 °W)(called sensitivity experiment),and then the results were compared with the contemporaneous data.

A high sensitivity experiment of two typical heavy rainfall of Yunnan Province is made by MM5 model.

Firstedly, using NCEP-FNL global reanalysis grid data analysed this vortex, and then the numerical experiment by WRF was conducted to reproduce this process, based on the analysed conclusion, corresponding sensitivity experiments were designed, in order than, analysed conclusion can be confirmed.

A simulation of typical weather event about meso-scale lows occurred in PBL over the North-China Plains and a series of its sensitivity experiments are carried out by using PSU/NCAR s MM4 mesoscale model,which examines the MM4 s forecast capability for the meso-scale systems in PBL.

By using NCC-T63 coupled with land-surface process model, sensitivity experiments of desertification or virescence grass over the west part of China are implemented to study the effect of vegetation type on the climate.