With　the　increasing　recognition　of　electromagnetic　radiation　to　human　health　and　environment,　research　on　the　dielectric　phenomenon　and　the　explanation　on　polarization　theory　of　biological　tissues　has　become　an　important　part　of　biological　dielectric.　Our　recent　study　about　low-frequency　polarization　characteristics　of　SD　(Sprague　&　Dawley)　rat　tissues　found　that　the　polarization　characteristic　of　tissues　is　consistent　with　CS　(Curie-von　Schweidler)　polarization　theory　in　a　and　PI　relaxation　polarization　frequency　band.　In　this　paper,　a　designed　electrode　system　was　used　to　test　the　dielectric　parameters　of　typical　SD　rat　tissues　(liver,　etc.)　by　LCR　impedance　analyzer　in-vitro　at　room　temperature.　According　to　related　Cole-Cole　plot,　polarization　model　of　SD　rat　liver　at　this　range　is　not　a　single　Debye　polarization,　but　an　intricate　model　accompanied　with　multiple　polarization　processes　where　Debye　and　CS　polarization　theory　have　different　proportions　at　this　frequency　range.　Meanwhile,　polarizations　of　other　typical　tissues　(lung,　kidney)　are　also　in　line　with　the　theory　of　CS　polarization.　With　the　variation　of　the　imaginary　part　and　the　dielectric　modulus,　the　CS　polarization　model　of　SD　rat　in　this　frequency　range　was　obtained,　and　the　application　value　of　CS　polarization　theory　in　the　phenomenon　of　biological　tissue　polarization　was　verified.　Therefore,　at　this　frequency　range,　CS　polarization　model　of　the　biological　tissues　can　be　used　for　further　study　on　the　biological　dielectric　polarization.