Light field 3D display is a promising naked-eye 3D display technology, which can provide the viewer with 3D images from different viewing angle and present realistic stereo vision. The traditional flat light field 3D display system has the problem of narrow 3D viewing angle, while the curved light field 3D display system can significantly increase the 3D viewing angle. In the paper, a 3D display system of curved light field based on lenticular lens was designed, and an independent camera shooting method based on back ray tracing was proposed for lens non-integer multiple covering pixels. The structure of the curved light field 3D system is shown in Fig.1(a), which is composed of a curved display screen and a lenticular lens. In order to avoid the influence of color Morie fringes, and to balance the loss of horizontal and vertical resolutions, the lenticular lens was usually placed with a tilt angle, resulting in a non-integer number of pixels covered by each lens. In view of this situation, the paper proposed an independent camera shooting method. By establishing a spatial coordinate system, the spatial coordinates of each pixel and virtual camera were independently calculated, and all light vectors required for rendering were determined. Combined with back ray tracing technology, the corresponding curved light field image of the system was efficiently and conveniently generated, and the display device had a viewing angle as wide as 54°.In the experiment, a curved light field 3D display device was built up as shown in Fig.5. After loading the generated curved light field image to the display screen, a clear 3D image was presented with smooth and continuous parallax, and the viewing angle was from left 27° to right 27°. The measured 3D viewing angle was close to the theoretical value. It showed that the independent camera shooting method proposed in this paper could generate correct light field image for the light field 3D display system in the case of non-integer multiple coverage.In order to increase the 3D viewing angle of light field 3D display, this paper designed a curved light field 3D display system, and proposed an independent camera shooting method based on reverse tracking for the case that the lens covers pixels in non-integer multiples. In this method, an independent virtual camera was set up for each pixel to take corresponding shots. By calculating the spatial coordinates of pixels and the virtual camera, all the ray vectors required for rendering were determined. Combined with the back ray tracing technology, the curved light field 3D image was efficiently and conveniently generated. The experimental results showed that the method could generate the corresponding 3D source for the system, and the system displayed clear 3D images in the continuous viewing angle from left 27° to right 27°, presenting continuous and smooth moving parallax. The method proposed in this paper can also generate the corresponding 3D source for the light field 3D display system of the special-shaped display screen, and will become an important technical solution for the further development of the light field 3D display.