Humus fractions and optical property of humic acid on alkalized meadow soil were analyzed during different age at the 15 years longterm organic fertilization in Yongle town,Zhaozhou county,Heilongjiang province.Through the combination of agriculture and animal husbandry,longterm organic fertilization on saline soil,soil total organic carbon content and humic acid,humin content in humus were increased by 1163%,1207% and 2592% with years increased significantly,but it had little effect on fulvic acid,compared with the control;The HA/FA was increased by 1292% and the physical and chemical properties of soil had also been improved;The logK during 15 years showed a increasing trend and increased by 357%.This test would provide a scientific theoretical basis for thoroughly improving alkalized meadow soil by the combination of agriculture and animal husbandry.