Taking Jingbian gas field A area as an example,this paper analyzes the interlayer production difference and main control factors of commingling production gas reservoir by using drilling and production dynamic data and through calculation and analysis of geological reserves,dynamic reserves,discharge radius and dynamic-static reserves ratio. The results show that the dynamic and static reserve ratio of the small layer is 6.8% minimum and 79.8% maximum in Jingbian gas field. The utilization of gas reservoir shows a pattern of one high and the rest low,the utilization of Ma 513 is prominent,and the utilization of other layers is generally low;The correlation analysis shows that the interlayer production difference is controlled by reservoir physical properties,especially permeability,which shows that the ratio of static and dynamic reserves of small layer increases exponentially with permeability.