Recently most kinds of digital cameras acquire color image by imaging instrument composed by Bayer color filter and CC D sensor.A new format color filter is proposed in this paper.It has not only the sampling character but also the tricolor gratings encoding character.On the fre quency spectrums plane of the encoded image,the red,green and blue information p a rts are separated.The analyst shows that the new color filter can make the decod ing processing simple comparing to Bayer color filter.The simulation experiment in this paper proves its feasibility used for digital camera.