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We propose a method based on the process of extracting gravitational wave(GW) parameters from GW signals to simulate the binary neutron-star (BNS)merging events. We simulate 1000 GW standard sirens based on the observation ofthe Einstein Telescope (ET). Almost all the simulated GW data are in theredshift range of $[0,3]$. The role of the GW standard siren in the inferenceof the cosmological parameters is investigated. We find that the GW data canhelp improve the accuracy of cosmological parameters. Moreover, the degeneracyof cosmological parameters is broken by the GW data. The GW standard siren ishelpful for the constraint of the cosmological parameters.

Impacts of the simulated standard siren on estimating cosmological parameters