The invention discloses a method for improving the uniformity of a white point of a kinescope; designs are carried out on the internal and the external curved surfaces of a screen; the falling off amount of the point of the effective surface corner of the external curved surface of the kinescope screen furthest to the center of the screen relative to the center of the external surface of the screen is h; in the section of the kinescope shaft of a colorful kinescope, the inside curve of the screen surface is formed by the crossing of the plane of the kinescope shaft and the internal curved surface of the screen; the inside curve is arranged between the surrounding sides which play the role of displaying the effective ranges in the center of a screen surface P0; the screen surface is at least provided with one section with inflexion points; the tangent of the internal curve and the kinescope shaft are orthogonal to form the maximum value of a plane angle of Alpha between the center of the screen surface P0 and the inflexion points; the minimum value of the include angle formed by the tangent of the internal curve and the plane vertical to the kinescope shaft is Beta between the inflexion points and the surrounding sides which display the effective ranges; the values should meet that Beta/Alpha is equal to or more than 0.6 and less than 1.0. The method can improve the uniformity of the white point and increase the brightness ratio.