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Galaxy-galaxy strong gravitational lens (GGSL) is a powerful probe for theformation and evolution of galaxies and cosmology, while the sample size ofGGSLs leads to considerable uncertainties and potential bias. The China SpaceStation Telescope (CSST, planned to be launched in 2025) will conductobservations across 17,500 square degrees of the sky, capturing images in the$ugriz$ bands with a spatial resolution comparable to that of the Hubble SpaceTelescope (HST). We ran a set of Monte Carlo simulations to predict that theCSST's wide-field survey will observe $\sim$160,000 galaxy-galaxy strong lensesover the lifespan, expanding the number of existing galaxy-galaxy lens samplesby three orders of magnitude, which is comparable to the Euclid telescopelaunched during the same period but with additional color information.Specifically, the CSST can detect strong lenses with Einstein radii above$0.64\pm0.42$ arcsec, corresponding to the velocity dispersions of $217.19 \pm50.55 \, \text{km/s}$. These lenses exhibit a median magnification of $\sim$5.The apparent magnitude of the unlensed source in the g-band is $25.87 \pm1.19$. The signal-to-noise ratio of the lensed images covers a range of $\sim20$ to $\sim 1000$, allowing us to determine the Einstein radius with anaccuracy ranging from $\sim 1 \%$ to $\sim 0.1 \%$, ignoring various modelingsystematics. Besides, our estimations show that CSST can observe uncommonsystems, such as double source-plane and spiral galaxy lenses. The aboveselection functions of the CSST strong lensing observation help optimize thestrategy of finding and modeling GGSLs.

CSST Strong Lensing Preparation: Forecast the galaxy-galaxy strong lensing population for the China Space Station Telescope