[Objective] The purpose was to discuss the dormancy characteristic of Alnus sibirica Fisch.ex Turcz seeds and the processing methods of breaking its dormancy.[Method] Through detecting germination-inhibitor in seeds and seed germination experiment,the factors influencing the germination of A.sibirica seeds were studied.[Result] The water,ethanol and acetone extracts at different concn.of A.sibirica seeds had obvious inhibition effects on the germination of Chinese cabbage seeds.The natural germination rate ...