With　the　ever-growing　availability　of　Virtual　Reality　(VR)　products,　the　360-degree　video　has　a　widespread　application　prospect,　which　also　brings　new　challenges　to　its　quality　assessment.　Considering　its　unconventional　display　environment,　the　users＇　attention　on　360-degree　video　may　be　significantly　different　from　its　conventional　2D　version.　Recently,　the　Weighted-to-Spherically-uniform　Peak　Signal-to-Noise　Ratio　(WS-PSNR)　was　developed　to　weight　PSNR　by　its　covered　area　in　360-degree　video　display.　In　this　work,　we　find　that　the　average　attention　per　area　still　differs　subject　to　its　latitude.　Thus　we　propose　to　utilize　this　average　attention　to　formulate　a　latitude-based　quality　weight　matrix.　Through　experiments,　this　new　matrix　outperforms　that　of　WS-PSNR　in　pooling　of　PSNR　when　latitude-based　quality　fluctuations　exist　in　360-degree　video　display.