Aiming at the problems of color cast and incomplete dehazing in dehazing process, an image dehazing algorithm based on haze distribution and adaptive linear attenuation is proposed. Based on the nature of hazy image degradation and the negative correlation between haze and transmittance, an adaptive linear attenuation model is proposed to estimate the dark channel of clear image, and the transmittance is obtained. According to the characteristic that atmospheric light can only reflect brightness information, the haze distribution can be used to improve the local atmospheric light, and the dehazing result can be obtained by atmospheric scattering model. The experimental results show that the proposed algorithm has the advantages of thorough dehazing, natural color and suitable brightness, and has achieved satisfactory results in both subjective and objective evaluation.