星系的恒星质量分布能给出星系形成和演化的重要限制。WISE数据给出全天4个红外波段测光信息。我们把MPA-JHU源表和WISE全天巡天交叉，拟结合2MASS或UKISS用恒星星族模版采用星族合成方法拟合星系的多波段光谱能量分布(u,g,r,i,z,J,H,K,W1,W2)，预期比MPA-JHU更准确地估算星系恒星质量；基于新质量重新推导3.4微米光度估算星系恒星质量的公式，把各种方法推导的星系恒星质量对比总结；研究3.3PAHs发射对3.4微米光度的影响与星系性质的关系；拟找出与3.4微米质光比紧密相关的本征参量，如初始质量函数，光学光谱、形态类型，恒星形成率，比恒星形成率，星系颜色，星系Hα等值宽度，星系消光，金属丰度，AGN强度等，采用多参量拟合质光比，给出3.4微米单波段更精确的质量估算方法。我们采用包括近红外波段（主要指W1,W2）的更宽光谱能量分布，进一步推进星系恒星质量的研究。

The mass distribution of galaxies can be used to give important constraints on galaxy formation and evolution. The WISE all-sky survey provides 4 infrared photometries in the whole sky. The match of the WISE all-sky survey and MPA-JHU catalogue produces the biggest sample with both infrared photometries, the optical photometries and spectra information. This sample in combination with 2MASS or UKISS will give wider spectral energy distribution from the optical to infrared. We plan to fit the spectral energy distribution(u,g,r,i,z,J,H,K,W1,W2) by stellar population synthesis to obtain the stellar masses; We plan to rederive the formulae to calculate the stellar mass by 3.4μm luminosity using the new stellar masses from multiband photometries fit. The stellar masses derived from all kinds of methods are compared; The correlation between galaxy properties and the ratio of 3.3μm PAHs emissions in the 3.4μm luminosity is another work; We plan to study the intrinsic parameters related to M/L3.4, for example, initial mass function, optical spectral types, morphology types, SFRs, SSFRs, color, EQW(Hα), the intrinsic extinction, metallicity, AGN features. Multi-parameters will be used to fit M/L3.4 to supply more accurate calculation according to the 3.4μm band. Using wider wavelength spectral energy distribution including near-infrared bands(W1,W2) could give more accurate stellar masses estimations than MPA-JHU catalogue which only includes optical bands.