In this article,a miniaturized band-stop filter based the dual composite right/left-handed(DCRLH)[CM)]cell is proposed. Through the theoretical analysis of the equivalent circuit model of DCRLH, it is demonstrated that the right and left-handed pass-bands of DCRLH cannot be integrated even in the balanced condition and thus DCRLH cell exhibits inherently band-stop property. Through parametric scanning analysis, it is found that the band-stop property is quite excellent in the quasi-balanced condition. Based on the above results of the investigation, a band-stop filter is designed and fabricated further. The performance of the proposed band-stop filter is rather satisfactory. Simultaneously, its effective area is quite compact, because only one DCRLH cell is utilized. Both the simulated and measured results verify that the proposed design method is effective.