We investigate the properties of symmetrical triangular quantum wells composed of InGaAs/InAs chirped superlattice,which is grown by gas source molecular beam epitaxy via digital alloy method.In the quantum well structure tensile AllnGaAs are used as barriers to partially compensate for the significant compressive strain in the wells,the strain compensation effects are confirmed by x-ray measurement.The photoluminescence spectra of the sample are dominated by the excitonic recombination peak in the whole temperature range.The thermal quenching,peak energy shift and line-width broadening of the PL spectra are analysed in detail,the mechanisms are discussed.