Firstly,　based　on　the　basic　characteristic　curves　G/Gmax-γ　and　λ-γ　revealed　by　the　results　of　the　soil　dynamic　tests,　the　rules　of　adjustable　double-parabola　constitutive　curves　of　reverse　unload　after　load　process　or　reverse　load　after　unload　process　in　irregular　load　history　are　established,　and　function　implementation　and　implement　of　A　type　and　B　type　parabola　are　expounded　for　the　characteristics　of　reverse　load　or　unload　curves　sometimes　change　more　flatly　at　first　and　then　acutely.　Secondly,　by　comparisons　of　9　methods　simulated　results　of　soil　test　damping,　the　load　and　unload　rules　of　double-parabola　model　accord　with　the　test　results,　especially　accord　with　the　value　of　soil　test　damping,　and　they　can　be　regarded　as　the　simplification　and　practicality　of　generalized　Masing　rule.　Because　of　the　adjustment　coefficient　Ad　can　be　changed,　the　model　has　more　powerful　capability　of　simulation　the　shape　of　constitutive　relationship　curves.　At　last,　using　the　borehole　array　records　of　Taiwan　Lotung　DHB　field　test,　the　nonlinear　seismic　response　of　DHB　site　are　analyzed　by　equivalent　linear　method　SHAKE91,　LSSRLI-1,　nonlinear　method　in　time　domain-DESRA-2,　Pyke　model,　Non-Masing　rule　model　ONE,　implicit　stress　damping　equivalent　model,　damping　degradation　coefficient　model,　Non-Masing　rule　model　TWO　and　double-parabola　constitutive　model　respectively.　After　compared　all　the　synthesizing　acceleration　ground　motions　with　the　observation　records,　we　found　the　PGA　of　double-parabola　model　are　almost　equal　to　the　observation　value,　the　comparative　size　relations　of　waveform,　subsequence　waveform　are　agree　well　with　the　records.　As　a　result,　the　rationality　of　double-parabola　constitutive　model　and　the　feasibility　in　practical　engineering　application　are　manifested.