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Aims Caragana korshinskii is the dominant species in the hilly area of northwest Shanxi, which plays very important roles in maintaining community species diversity, ecosystem stability and soil environment restoration. Methods In order to investigate the stoichiometric characteristics of carbon (C), nitrogen (N), phosphorus (P) in the ecosystem of C. korshinskii artificial forest with different ages and their effects on leaf photosynthesis, the plant leaves and soil of C. korshinskii artificial forest with different ages (0, 6, 12, 18, 40, and 50 years) were collected. The variations of C, N, P stoichiometry in plant leaves and soil were analyzed. Important findings With the increase of plantation time, the contents of C and N in the leaves of C. korshinskii increased significantly, while the contents of P increased firstly and then decreased. The contents of C, N and P in