An achromatic lens based on radial gradient index (GRIN) is proposed,which effectively suppresses the chromatic aberration effect of optical systems.Firstly,the radial GRIN lens has the advantages of the lower spherical aberration,better-focusing imaging, and higher optical coupling efficiency.Considering the above advantages,an achromatic optical system of the radial GRIN lens is designed to eliminate the high-order aberration.Moreover,the optical power and spherical aberration of the optical system are optimized by controlling the operands POWR and SPHA in ZEMAX software.Finally,the optical power and dispersion model of the achromatic optical system based on radical GRIN lens is derived and established.At the same time,the achromatic effect comparative experiments for the radial GRIN lens and homogeneous doublet lens are conducted.The experimental results show that the radial GRIN lens can achieve good achromatic function in the wavelength range of 486—656 nm.The achromatic effect is significantly better than the homogeneous doublet lens.The blur spots of the radial GRIN lens are all within the Airy spots,and the lens is well focused.The aberration is basically corrected and the diffraction limit is reached,which meets the imaging requirements of the achromatic lens well.