∴ o is OE⊥BD, connecting PE,

∴∠PEO is the plane angle of dihedral angle P-BD-C,

∵ quadrilateral ABCD is a rectangle,

∴BC⊥CD,DA⊥AB，

∫ point a moves to point p,

∴PD⊥PB，

And the projection of point p on the plane BCD is on the CD,

∴ Make PO⊥CD after point P,

∴PO⊥ BCD，

∴BC⊥ PCD，

∴PD⊥ People's Bank,

∴PD⊥PC，

∴△CPD is Rt△,

AB = 6，BC=23，

∴PC=26,PO=22

In Rt△DPB, PD=23, PB=6, BD=43.

∴PE=3，

∴sin∠PEO=POPE= 13，

So the answer is: 13.