Abstract: With the increasing of output and the extending of mining depth,to ensure the safety of mine ventilation system,it is necessary to reconstruct the ventilation system.The paper analyzes the necessity of mine ventilation reconstruction according to the practical situation of Xiaochang coal mine,and puts forward four options combined with the situation of coal mine.The best option is determined through a comparative analysis,then the paper introduces the entire process of ventilation system reconstruction in detail,including the parameters of new increased shaft and tunnel,calculation of ventilation resistance and air volume distribution,fan check and selection,analysis of technical economy and time limit,etc.It provides reference for the similar coal mine.