Although the existing high efficiency video coding (HEVC) standard is compatible with coding of high dynamic range (HDR) video,considering the high dynamic range and high precision of HDR video as well as the complex characteristics of the human eye′s perception,there are still a lot of perceptual redundancies in the encoded vide o.Therefore,an HDR video coding rate distortion optimization algorithm is proposed based on the contrast sensitivity function (CSF).First,according to the definition of CSF,t he relationship between contras sensitivity (CS) and the human eye′s sensitivity t o errors is obtained. Then,for the luminance component of 10-bit HDR video,coding tree unit (CTU) i s taken as the basic unit to get the adaptation luminance value and the spatial frequency which affect the visual contrast sensitivity.Finally,the contrast sensitivity is further correct ed as the visual perception factor.The Lagrange factor of CTU is scaled to achieve a more effici ent assignment of the code rate consistent with visual perception and remove the perceptual red undancies. Experimental results show that the code rate is 5.6% and 8.3% lower than that of the original coding platform with the same Q-factor of HDR-VDP-2.2and PSNR_DE scores,whi ch shows that the proposed method can effectively improve the performance of HDR video co ding.