A new method of recording the transmission marking 2D/3D rainbow hologram was put forward. It uses directly a scattered slit beam to illuminate the 2D transmission marking. The transmitted light was recorded on the master hologram. The latter can be recorded according to the colour separation and layer separation like the general two step rainbow hologram. But it broke through the limit of the length and area of the general hologram on the brightness and the viewing angle of the reconstructed image, thus the large viewing angle and high brightness were achieved. The feasibility and parameters of the optical set-up were discussed in detail and the satisfactory experimental results were obtained.