In this paper， aiming at the separation phenomenon of Gamma curve of dual-screen display products， the mechanism was studied through experimental verification such as physical analysis， electrical experiments， process data and adjustment of process conditions， as well as a large number of verification data. Through experimental measurements， it was known that there were differences in the cell gap and the pixel electrode CD between the upper and lower screens， resulting in differences in the transmittance of the upper and lower screens， then resulting in differences in Gamma between the upper and lower screens. Through process investigation and verification， it was found that the difference in the cell gap and the pixel electrode CD was caused by the influence of equipment hardware， resulting in poor uniformity of the adhesive starting position；and finally the process of sealing the upper and lower screens was achieved， the optimized film thickness was introduced and the pixel electrode CD increase process within the fluctuation range was improved. The Gamma curve separation defect was completely improved （defect rate of 12%） and the screen display quality of the product was improved.