Abstract: In order to study the phase shift of the carrier envelope of the linear chirped pulsed Gaussian beam in the propagation direction and the cross section, the phase shift was simulated. The results show the carrier envelope phase φCEP for beam with different pulse width undergoes a -π shift from negative infinity to positive infinity and gradually changes to -π/2.The farther from the original beam waist plane, the smaller the phase shift, and the smaller the radius to the axis.The phase shift of the carrier envelope is dependent on the relation between the phase front and the phase radius.