Application data of ERA-interim, routine observation,radar and lighting position,physical, a short heavy rain by convergence zone of two high in Yunnan province from 20:00 BT 25 to 20:00 BT 26 August 2015 was analyzed．The main results are as follows:(1)The falling area of short heavy rain is from south to north, from east to west with convergence zone moving.(2)The dynamic mechanism of the short heavy rain occurring and developing are sustainable vapor transportation by subtropical high, uplift by convergence line, severe ascending air.(3) Deep wet layer and warm cloud layer are beneficial to improve precipitation efficiency. (4)The frequency of short heavy rain reduce with cloud-top temperature area who is less than -70℃decreased in mesoscale convective cloud cluster.(5)The cumulus convection system moving slowly by the confrontation of two subtropical high is important reason for short heavy rain.(6) This example accompanied by significantly lightning activity, the number of positive flash increasing and negative flash decreasing with the increased of short heavy rain.