Abstract: Ambisonics is a series of spatial sound systems based on spatial harmonics decomposition and each order approximation of sound field． Both the accuracy of directional information reproduction and the complexity of system increase as the order of Ambisonics increases． Considering that the horizontal resolution of human hearing is higher than that of vertical direction，mixed-order Ambisonics reconstructs horizontal sound field with higher order spatial harmonics，while vertical sound field with lower order spatial harmonics is reconstructed，and thereby a compromise is reached between the perceptual performance and the complexity of system． By taking the 28 +1 layer-wise loudspeaker layout for example， the present work analyzes the binaural pressures in mixed-order Ambisonics reproduction and compares with the case in conventional high-order Ambisonics． When the corresponding binaural pressures in two systems are also compared for various target source directions，the results indicate that，for appropriate design and feasible loudspeaker layout，mixed-order Ambisonics improves the horizontal localization performance，and at the same time maintains the same off-horizontal localization performance as the high order Ambisonics． A series of virtual source localization experiments on Ambisonics reproduction validate the analysis． 

Key words: Ambisonics, mixed-order, localization, loudspeaker, reproduction