In order to improve the infrared image dehazing effect,using dark channel prior,an improved and fast method for single image dehazing is proposed.Firstly,atmospheric light intensity is obtained by image autoregulation,which is closer to the real value using the regulatory factors of dark and bright channel.Secondly,image dehazing region block contrast is judged using mean squared error,and transmission is adjusted using expansion and decrease coefficient.Thirdly,brightness is corrected using gray to avoid dim image.Finally,the algorithm flow is given.The experimental simulation shows that the color and edge detail information of IDCP has better visual effect than other algorithms,the average gradient is 6.0,the information entropy is 7.5,and the peak signal to noise ratio is 17.6 dB,which can satisfy the requirements of infrared image clearness and information.