One objective of this research is to investigate the influence of thermokarst lake formation on the soil environment and properties (including soil texture, water content, bulk density, soil nutrient) of alpine meadow in permafrost regions of the Beilu River basin. Especially, the soil organic matter, total nitrogen, other chemical substances and nutrients of the soils with various degree of vegetation degradation at the topsoil have been influenced considerably. Among all the components, the content of organic matter and total nitrogen have changed most evidently, and the content of organic matter and total nitrogen in non\|degraded slash is the richest, followed by the moderately degraded slash, and that in the severely degradation slash is the poorest. Whereas, change in total P and total K contents is the least. Correlation analysis demonstrates that there is a deep relation between thermokarst lake formation and vegetation degradation. Formation and developing of thermokarst lake result in soil texture and soil nutrient changing. Finally, the conclusion can be drawn that there is a significant impact of thermokarst lake formation on ecological environment in permafrost regions.

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