Abstract: The running of “Shenzhen partition storm intensity formula projection software” needs to get more types of maximum precipitation samples in the direfrent duration year by year from all the automatic weather stations in Shenzhen.As calculated volume and timeliness demanding, the pre-processing system on Shenzhen minute precipitation data was designed and developed,which has a "seamless connection" with the software.In this paper the system is introduced in detail about partition principle,the quality control on minute rainfall data,different duration sliding precipitation calculation,automatic determination of the different precipitation processes,sample selection,as well as function,process and design technique.Meanwhile,taking daily minute precipitation data at Shenzhen local station from 1961 to 2010 for example,the software was employed to calculate 8 maximum rainfall sequences including 9 durations for 5 minutes,10 minutes,15 minutes,20 minutes,30 minutes,45 minutes,60 minutes,90 minutes,120 minutes for every year.The results show that the system can meet the demands of  Shenzhen partition storm intensity formula projections software.