I thought this should not be a runtime problem because by looking into the vs project.I found unity just choose the portrait logo picture as the splash window picture. But I have set both windows phone and windows store project settings. I set the windows phone setting a autorotation and ticked 2 landscape orientation. The game works on the landscape mode but the logo and default splash windows is still portrait. I change the mode to just 'landscape right'.Unity just still choose the portrait logo as start window. I didnt change the logo picture to a 'fake landscape' because I want to know what's wrong with this.Thanks.