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In this work, we study the constraints on the scenario of light stops andsbottoms in the next-to-minimal supersymmetric standard model (NMSSM),especially by a 125 GeV Higgs boson discovery and the LHC bounds onsupersymmetry. The constraints from dark matter detections are also taken intoaccount. From the parameter scan, we find that the NMSSM can well accommodate alight Higgs boson around 125 GeV and decay patterns. We would like to stressthat the LHC direct supersymmetry searches with b-tagging are very powerful andcan set strong bounds on many NMSSM parameter points with light stops andsbottoms. We find $\tilde {t}\to b\tilde{\chi}^+_1$ is a very promising channelfor light stop detection if the mass splitting between $\tilde{\chi}^+_1$ and$\tilde{\chi}^0_1$ is very small. It is also pointed out that in order to closethe parameter space of light stops and sbottoms, new search strategies forsignal channels such as $p p \to {\tilde t_1} {\tilde t_1} \to t {\bar t} h h\tilde{\chi}^0_1 \tilde{\chi}^0_1$ and $p p \to {\tilde b_1} {\tilde b_1} \to t{\bar t} W^+ W^- \tilde{\chi}^0_1 \tilde{\chi}^0_1$ may be necessary.

Light stop/sbottom pair production searches in the NMSSM