Abstract: The methods of electron trapping correction in CdZnTe coplanar-grid detector were investigated by utilizing finite element method for simulating the weighting potential distribution of the coplanar-grid detector and calculating the charge induced efficiency and change induced signal.The results show that the nonuniform of detector response with the depth of interaction due to electron trapping can be corrected by the method of adjusting the relative gain（G） of the two grid signals prior to subtraction and the uniform detector response both in depth and lateral can be obtained by the method of adjusting the relative gain（G） to correct the electron tapping based on the uniform weighting potential distribution which can be obtained by double the width of the strip next to the edge grid strip of the detector.