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By linking galaxies in Sloan Digital Sky Survey (SDSS) to subhaloes in theELUCID simulation, we investigate the relation between subhalo formation timeand the galaxy properties, and the dependence of galaxy properties on thecosmic web environment. We find that central and satellite subhaloes havedifferent formation time, where satellite subhaloes are older than centralsubhaloes at fixed mass. At fixed mass, the galaxy stellar-to-subhalo massratio is a good proxy of the subhalo formation time, and increases with thesubhalo formation redshifts, especially for massive galaxies. The subhaloformation time is dependent on the cosmic web environment. For centralsubhaloes, there is a characteristic subhalo mass of $\sim 10^{12} \msun$,below which subhaloes in knots are older than subhaloes of the same mass infilaments, sheets, or voids, while above which it reverses. The cosmic webenvironmental dependence of stellar-to-subhalo mass ratio is similar to that ofthe subhalo formation time. For centrals, there is a characteristic subhalomass of $\sim 10^{12} \msun$, below which the stellar-to-subhalo mass ratio ishigher in knots than in filaments, sheets and voids, above which it reverses.Galaxies in knots have redder colors below $10^{12} \msun$, while above$10^{12} \msun$, the environmental dependence vanishes. Satellite fraction isstrongly dependent on the cosmic web environment, and decreases from knots tofilaments to sheets to voids, especially for low-mass galaxies.

Connections between galaxy properties and halo formation time in the cosmic web