imported fbx to maya, the exported fbx is a mess in unity

I import the fbx of this character into maya, and then ''export all''. The presets is shown in the right figure. The character turn out to be a mess as shown in the middle of the figure. The preview of the fbx is not smooth although I have checked the 'smooth mesh' in the export presets. And the vertices of every body part is much more, e.g. from 199 to 599 for the pants. Anyone know why? Thanks very much!