Objective] To find the physical-chemical properties of different steppe types in northern Tibet.[Method] Steppes in northern Tibet were divided and samples were collected randomly.The water content of topsoil, organic matter, content of total phosphorus and available potas-sium were measured.[Result] Topsoil water contents in different steppe types from high to low were in the order of alpine swamp meadow, al-pine meadow, alpine shrub meadow, and alpine semi-desertification steppe.Organic matter content of topsoil from high to low were in the order of alpine swamp meadow, alpine meadow, alpine shrub meadow, and alpine semi-desertification steppe.Total P contents of topsoil from high to low were in the order of alpine shrub meadow, followed by alpine meadow, alpine swamp meadow, alpine semi-desertification steppe.Alpine swamp meadow had the highest available P content of topsoil, followed by alpine shrub meadow, alpine meadow, alpine semi-desertification steppe.[Conclusion] We should strengthen the protection of degraded steppes and carry out rational utilization of topsoil water.%[目的]明确西藏藏北地区不同草原类型理化性质状况。[方法]将藏北地区草原进行划分，并随机采取样品，测定表层土（0～20 cm）含水量、有机质、全磷和速效磷的含量。[结果]不同草原类型表层土的含水量由高到低依次为高寒沼泽草甸、高寒草甸、高寒灌丛草甸、高寒半荒漠化草原；不同草原类型表层土的有机质含量由高到低依次为高寒沼泽草甸、高寒草甸、高寒灌丛草甸、高寒半荒漠化草原；不同草原类型表层土的全磷含量由高到低依次为高寒灌丛草甸、高寒草甸、高寒沼泽草甸、高寒半荒漠化草原；速效磷从高到低依次为高寒沼泽草甸、高寒灌丛草甸、高寒草甸、高寒半荒漠化草原。[结论]今后应加强对退化草原进行保护，并对草原进行合理利用。
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