The soil of five-year-old ginseng returned forestland from Jilin Baishan Songjianghe town was used as research objects，8 types of fertilizer (organic fertilizer，urea，potash fertilizer，perplex，beneficial microbe，DND triclosan，compound fertilizer，organic N & K mixed fertilizer) were spread，then the effects of different fertilization treatment on available nitrogen content were studied.The results showed that fertilization was helpful to enhance the content of soil alkali-hydrolyzable nitrogen.In June and September，application of organic N & K mixed fertilizer in 5-year-old ginseng returned forestland worked best，the best level was 300 g?m-2.