We report polarized femtosecond laser light mediated growth and programmable assembly of photoreduced silver nanoparticles into triply-hierarchical micropatterns. Formation of erected array of nanoplates of thickness as small as λ/27 (λ, the writing laser wavelength) level is demonstrated. The growth mechanism of nanoplates has been clarified: (i) the excited surface plasmons enhancing the local electric field and leading to spatially selective growth of silver atoms at the opposite ends of dipoles induced on early created silver seeds. (ii) The optical attractive force overcoming electrostatic repulsion in the enhanced local electric field to assemble the silver nanoparticles directly. The triply-hierarchical micropattern shape and location, the nanoplate orientation and thickness are all attained in controlled fashion.