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We synthesized F-substituted NdOBiS2 single crystals and measured superconducting transition temperature Tc, and critical magnetic field Hc1 and Hc2.Then the London penetration depth λab as a function of temperature T has been derived.The analysis of λab(T) is corresponded with the symmetry of superconductivity gap.Our analysis provides an evidence for a single band s-wave order parameter which needs to be confirmed from specific heat measurement.