Series of Ga- and Al-Substituted Na-fluorine micas NaMg2+xLi1-x(TxSi4-x-yGeyO10)F2 and NaMg2+xLi1-x(TxGe4-x-ySiyO10)F2; x=0.0-1.0, T=Ga, Al, y=0, 1, 2, 3, were synthesized. Variations of infrared spectra, lattice constants and swelling properties were studied, and compared with those of corresponding K-series micas. Continuous changes in basal spacing (c·sinβ) with increasing Ga- and Al-contents proved that there were complete series of solid solutions between the end member micas with an exception of NaMg3(AlSi3O10)F2. Linear relations between c·sinβ or b-axis values and mean radius of tetrahedral cation were obtained for Ga- and Al-substituted Na-micas having x-value of 1.0. However, the b-axis values of Na-micas are far smaller than those of corresponding K-analogues, demonstrating that the degree of distortion in tetrahedral rotation angle α and octahedral flattening angle ψ is determined by the size of interlayer cation as well as that of tetrahedral cation. The values of α for Na-micas increased with the amounts of Ga- and Al-substitution. Na-micas lose also their swelling ability with increasing Ga- and Al-substitution. The loss of hydration property of interlayer cation results from the increase of α and the change of charge balancing, which increase the stability of interlayer structure.