Kela 2 gas field is the biggest land monoblock dry gas reservoir which has been discovered in China so far It is essential to make it a high productivity gas field as it is the main production area of "West|East Natural Gas Transportation" Project Kela 2 gas field is an overpressure reservoir The formation pressure of this gas field is very high (74 36 MPa) And its pressure parameter is as high as 2 or more During the natural depletion, the overpressure formation rock will stand the net weight  above as reservoir pressure is getting lower and lower. And great plastic deformation would occur in the formation rock. Such characteristics as permeability, porosity and compressibility factor will decrease. And it would negatively affect gas production. And so, during the development of Kela 2 gas field, rock deformation is a watchful problem for production capacities.This paper is to research the overpressure rock deformation characteristics of Kela 2 gas field and its effects on gas production according to rock coverage experiment.