Based　on　the　simulation　results　of　the　typical　rural　ultra-low　energy　building　(ULEB)　in　five　different　climatic　regions　of　China,　three　indicative　technical　pa-rameters　for　paralleled-loop　exhaust　air　heat　pump　(PEAHP)　R&D　which　are　nominal　heating-cooling　capacity,　maximum　required　fresh　air　to　return　air　ratio　(MFRR)　and　system　energy　efficiency　grades　were　calculated　and　summarized　ac-cording　to　the　demand　of　indoor　thermal　comforts　by　using　statistic　method.　The　nominal　heating-cooling　capacities　were　determined　according　to　the　peak　loads,　which　are　6.84-2.01　kW,　5-2.96　kW,　3.9-4.6　kW,　3.08-5.02　kW,　and　3.4-0.46　kW　in　the　ULEB　of　Harbin,　Beijing,　Shanghai,　Guangzhou,　and　Kunming,　respectively.　To　ensure　both　thermal　comforts　and　energy　conservation,　during　the　heating　sea-son,　full　fresh　air　supply　is　suggested　in　Beijing　and　the　1:0.5　MFRR　is　suggested　in　Harbin,　Shanghai,　Guangzhou,　and　Kunming.　During　the　cooling　season,　the　1:5　MFRR　is　suggested　in　Shanghai　and　Guangzhou,　the　1:3,　1:1.5,　and　1:0.5　MFRR　are　suggested　in　Harbin,　Beijing　and　Kunming,　respectively.　The　PEAHP　energy　efficiency　grades　1　similar　to　5　are　7.92　similar　to　11.7,　7.58　similar　to　11.5,　7.5　similar　to　11.35,　6.12　similar　to　9.27,　and　4.64　similar　to　7.03　during　the　heating　season　of　Harbin,　Beijing,　Shanghai,　Guangzhou,　and　Kunming,　respectively,　and　are　2.33　similar　to　3.54,　3.93　similar　to　5.96,　4.61　similar　to　6.98,　4.62　similar　to　6.99,　and　2.04　similar　to　3.1　for　the　cooling　season,　respectively.