Abstract: Agro climatic indices are widely used to reflect the impact of weather conditions on agricultural production,but its calculation is usually cumbersome.In order to make the calculation to be more efficient,convenient,and to meet the needs of modern meteorological operations and research,authors developed a common agro climatic index computing software (CAIC)by using Visual BASIC 2008 programming language.Based on the principles of agricultural meteorology,meteorological industry standards and statistics,37 common agro climatic indices were selected including 18 temperature indices,6 precipitation indices,7 sunshine indices and 6 crop meteorological indices.For the index of effective accumulated temperature,in addition to the conventional method,CAIC provided another calculation method based on daily temperature curve CAIC was composed of the database,user interface,input/output and index computing modules.From the results of testing and comparing,CAIC was proved to be applicable and comprehensive,with the characteristics of smart,batch operational,easily-expanded and diverse methods provided CAIC can be a practical and effective tool in agro meteorological services and related research work.

Key words: Agro meteorology, Climatic resources, Index, Data base, Software tool