Based　on　the　experiments　of　two　single-span,　single-story,　partially　prestressed　concrete　frames　with　unbonded　tendons　under　horizontal-low-cyclic　loading　with　constant　vertical　loading,　which　just　have　different　partially　prestressed　ratio　in　beams,　this　paper　inquires　into　the　cracks　distribution,　damage　state,　the　ultimate　capacity,　the　stress　of　the　unbonded　tendons,　ductility　features,　the　energy-dissipating　capacity　and　the　hysteretic　characteristics　etc.　Furthermore,　the　main　factor　of　aseismic　properties　of　the　structure　is　also　discussed　in　this　paper.