ThepossiblegeometricalstructuresandrelativestabilitiesofsemiconductormicroclustersGa.P.(n=1-4)werestudiedbyvirtueofdensityfunctionalcalculationswithgeneralizedgradientapproximation(B3LYP).ForthemoststableisomersofGa,,P.(n=1-4)clusters,theelectronicstructure,vibrationalproperties.dipolemoment,polarizabilityandionizationpotentialwereanalyzedbymeansofHF.MP2.CISDandB3LYPmethodswithdifferentbasissets.