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In this paper, the decay constants and mean square radii of pseudoscalarheavy mesons are studied in the SU(3) symmetry breaking. Within the light-frontframework, the ratios $f_{D_s}/f_D$ and $f_{B_s}/f_B$ are individuallyestimated using the hyperfine splittings in the $D_{(s)}^*-D_{(s)}$ and$B_{(s)}^*-B_{(s)}$ states and the light quark masses, $m_{s,q}$ ($q=u,d$), toextract the wave function parameter $\beta$. The values $f_{D_s}/f_D=1.29\pm0.07$ and $f_{B_s}/f_B= 1.32\pm 0.08$ are obtained, which are not onlychiefly determined by the ratio of light quark masses $m_s/m_q$, but alsoinsensitive to the heavy quark masses $m_{c,b}$ and the decay constants$f_{D,B}$. The dependence of $f_{B_c}/f_B$ on $\Delta M_{B_cB^*_c}$ with thevaried charm quark masses is also shown. In addition, the mean square radii areestimated as well. The values $\sqrt{<r^2_{D_s^+}><r^2_{D^+}>}=0.740^{-0.041}_{+0.050}$ and $\sqrt{<r^2_{B_s^0}><r^2_{B^0}>}=0.711^{-0.049}_{+0.058}$ are obtained, and the sensitivities of $<r^2_P >$ onthe heavy and light quark masses are similar to those of the decay constants.

SU(3) symmetry breaking in decay constants and electromagnetic properties of pseudoscalar heavy mesons