  The joint detection of GW signals by a network of instruments will increase
the detecting ability of faint and far GW signals with higher signal-to-noise
ratios (SNRs), which could improve the ability of detecting the lensed GWs as
well, especially for the 3rd generation detectors, e.g. Einstein Telescope (ET)
and Cosmic Explorer (CE). However, identifying Strongly Lensed Gravitational
Waves (SLGWs) is still challenging. We focus on the identification ability of
3G detectors in this article. We predict and analyze the SNR distribution of
SLGW signals and prove only 50.6\% of SLGW pairs detected by ET alone can be
identified by Lens Bayes factor (LBF), which is a popular method at present to
identify SLGWs. For SLGW pairs detected by CE\&ET network, owing to the
superior spatial resolution, this number rises to 87.3\%. Moreover, we get an
approximate analytical relation between SNR and LBF. We give clear SNR limits
to identify SLGWs and estimate the expected yearly detection rates of
galaxy-scale lensed GWs that can get identified with 3G detector network.
