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In recent years,magnetic nanoparticles have attractedmuch research interest for their potential applications intargeteddrug delivery[1,2,3],magnetic hyperthermia[4]and imagingmedical diagnosis such as Magnetic Resonance Imaging(MRI)[5].All these applications needs a accurate measurement of the magnetic moments.In previous works,a theoretical models of measuring the collective magnetic moments of colloidal magnetic nanoparticles by a kinetics-based method was proposed[6].In this work,we realize this method by designing a new magnetic field and experiment system which overcomes some limitations to realize the measurement practically.