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Extending the ideal MHD stability code MISHKA, a new code, MISHKA-A, isdeveloped to study the impact of pressure anisotropy on plasma stability. Basedon full anisotropic equilibrium and geometry, the code can provide normal modeanalysis with three fluid closure models: the single adiabatic model (SA), thedouble adiabatic model (CGL) and the incompressible model. A study on theplasma continuous spectrum shows that in low beta, large aspect ratio plasma,the main impact of anisotropy lies in the modification of the BAE gap and thesound frequency, if the q profile is conserved. The SA model preserves the BAEgap structure as ideal MHD, while in CGL the lowest frequency branch does nottouch zero frequency at the resonant flux surface where $m+nq=0$, inducing agap at very low frequency. Also, the BAE gap frequency with bi-Maxwelliandistribution in both model becomes higher if $p_\perp > p_\parallel$ with a qprofile dependency. As a benchmark of the code, we study the m/n=1/1 internalkink mode. Numerical calculation of the marginal stability boundary withbi-Maxwellian distribution shows a good agreement with the generalizedincompressible Bussac criterion [A. B. Mikhailovskii, Sov. J. Plasma Phys 9,190 (1983)]: the mode is stabilized(destabilized) if $p_\parallel < p_\perp(p_\parallel > p_\perp)$.

Modeling the effect of anisotropic pressure on tokamak plasmas normal modes and continuum using fluid approaches