Abstract: Wild rice is important heritable material.There are abundant wild rice in Yunnan province.The contents of amino acids,carbon and nitrogen of a few kinds of wild rice and cultivated rice’s stem,leaves and seeds were analyzed.The results showed that there were obvious differences in total amino acid content among the concerned materials.Oryza minuta has the highest content,56.8 mg/g.Wild field collected Yuanjiang type of Oryza rufipogon has the least content,22.8 mg/g.The variation of calculated C/N ratio and protein content were within 12—38 and 6%—20% respectively.The relativity of the contents and components of amino acids in wild rice tissues and seeds were also analyzed.We found that the amount of amino acids in plant tissues can reflect that of seeds,to some extent.The application on assessment of tissue amino acids and C/N ratio in plant germplasm resources were also discussed.