The study on flexural behavior of steel-recycled aggregate concrete composite beamswith profiled steel sheeting is conducted by comparing seven steel-recycled aggregateconcrete composite beams and two ordinary concrete composite beams.　　It is to study the mechanical performance of the composite beams based on theexperiments results ,the influence of the shear span ratio and the studs layout of thecomposite beams.We focus more on which type of changes:　　The cracks type-the slippage of interface between the steel shape and compositeslabs-the failure modes of composite beams-strain developing of concrete and steel shapeas well as profiled steel sheeting.　　We also focus on: the bending bearing capacity and vertical shearing capacity of thecomposite beams and the calculation formulas of the bearing capacity of the steel lightconcrete composite beams.　　Recycled concrete coarse aggregate replacement rate is 100％ with natural sand as fineaggregate, studies shows that the failure process between recycled aggregate concretecomposite beams and ordinary concrete composite beams are similar.The studs layout havelittle effect on bending bearing.Elastic flexural bearing increases with the increase ofshear-span ratio, flexural bearing capacity, influence remain the same.Increasing the heightof concrete composite beams can significantly improve the ultimate bearing capacity.　　Ultimate flexural capacity and deflection of the beam have same deviations with chinasteel specifications due to the slip effects.Based on the experiments results it was denotedthat:　　All the composite beams were failed in shear bending failure mode which wasinitiated by the shear failure of the composite slab.　　Although the composite extent of the composite beam specimens were smaller thanthe required composite extent from the design code,there were not obvious slip on theinterface until the load up to 80％ of maximum load which also means plain-sectionassumption were tenable before the load up to 80 ％ maximum load and the compositebeam specimens showed good mechanical behavior,including high bearing capacity andgood ductility,therefore partial composite beam could be adopted and design.Furthermore ,the vibration characteristic including the vibration frequencies and damping ofthe composite beams specimen were smaller.