This paper have studied the structures、microstrain distributions、and optical properties of self-assembled quantum wires Ga1-xInxAs made of sho rt-period superlattices with strain induced lateral ordering. The research has t aken into account of valence-band anisotropy, band mixing and effects due to mic rostrain distributions at the atomistic level. The results show that the selfa ssembled QWRs have favorable optical properties for application in infrared dete ction with normal incidence. The wavelength for subband transitions ranges from 10 to 20μm with the length of QWR period varying from 15 to 30nm. The wavelengt h for inter-band absorption is in the midIR range.