Abstract: Ferroelectric glass-ceramics of the （Na,K） NbO₃ system with different Ba²⁺ content have been prepared by melting method.Ba²⁺ was used as nucleating agent to improve the crystallization tendency and increase the dielectric constant of the glass-ceramic,and the inter facial polarization in glass-ceramic composites can be weakened by the pinning effect of the Ba²⁺ to increase the breakdown strength. The effect of different Ba²⁺ content on crystallization type,crystallization content,micro structures and dielectric properties of the glass-ceramics are studied using XRD techniques,SEM and LCR analyzer. The results show that with the increase of Ba²⁺ content,the energy storage density of （Na,K） NbO₃ glass ceramics first increases and then decreases.The sample with 10 wt% Ba²⁺ achieves the highest energy storage density of 1.02 J/cm³.