Abstract: This article is based on the inversion of 28 squall line process observed by the doppler radar from 2004—2014 in Pu 'er.By analyzing the comparison of radar products,we have several conclusions.Most of the squall line process happens from Mar to Sep,the average life of them is about 3.6h,82% of them generated on 14:00—22:00pm.There are five paths of the squall line process,and the type 1 and type 4 squall line thunderstorm cell is stronger than type 2,type 3 and type 5.When the monomer of type 2,type 3 and type 5 die out,there will be a broad stratiform precipitation echo existing in the “zero layer bright band”at 8—10km,and their shape is irregular.The characteristic such as the fuzzy radial velocity of the squall line,the BWER in adverse wind area,MARC,cyclone,echo wall,genting on,groin,is conducive to the strengthening of thunderstorm cell and squall line maintenance.The intension increase or decrease of the new monomer before the squall line indicates the strengthen or subduction of the squall line.Hail process always happens in the squall line of type 1,especially when the VIL is about 49—76kg·m-2.