[Objective] The study analyzed the variation of soil organic carbon (SOC) and nitrogen (N) content under different micro-topography in alpine grassland area in order to provide a theoretical basis for the reasonable use of grassland in alpine grassland.[Methods] This study selected 7 different kinds of micro-topography in alpine grassland of Tianzhu to measure SOC and N in the land surface(0-30 cm).[Results] With the increase of soil depths, the content of total N and NH₄-N decreased at the flat area of valley bottom. The content of soil total N showed a "V" trend and NH₄-N decreased in different position of north-facing slopes. In different position of south-facing slopes, the content of soil total N decreased, but soil content of NH₄-N showed an increase trend initially and decreased later. With the increase of soil depths, the content of SOC decreased in all micro-topography, while the content of soil hydrolyzable nitrogen decreased in terrace, middle and south-facing slope, middle and north-facing slope micro-topography. The content of hydrolyzable N decreased initially and then increased in bottom and south-facing slope and bottom and north-facing slope micro-topography, while increased initially and then decreased in top and south-facing slope and top and north-facing slope.[Conclusion] The variation of total N, hydrolyzable N and SOC content at different topographic positions was ranked as:bottom slope > top slope > middle slope. The content of NH₄-N decreased initially and then increased. In conclusion, the variation in micro-topography impacts the content of SOC and N dramatically.