The Photoluminescence (PL) Spectra and the double-Crystal X-ray diffraction rocking curves from tensile-strained quantum materials with 2 and 3 wells are reported in this paper.They indicate that PL peaks result from the intrinsic recombination mechanisms between the electrons in the first conducting subband and the holes in the first light,heavy hole subband in the quantum well materials.We have analysed the variation of the twin-peak intensity ratio with temperature theoretically.The calculation result for No.577 and No.572 is basically in agreement with the measured one.The approximate relation of the split value ΔE1 of light-heavy hole subband with the mismatch rate ε is found.The difference of the theoretic calculation value and the measured result for the split value from the first light hole subband and the first heavy hole one is discussed.