Unreasonable fertilizer input and low fertilizer utilization are the important factors that restrict the development of maize in Heilongjiang Province at present. The biochar based fertilizer can effectively improve soil physical and chemical properties and increase crop yield, but the effect of biochar based fertilizer on silage maize in cold region has not been reported. In this paper, the effects of biochar based fertilizer on soil nutrient content, dry matter accumulation and yield of silage maize in sandy loam were studied by random block design under field conditions.The results showed that F₁-F₅ increased the content of available P in silage maize soil at different growth stages. In grouting stage and mature stage, the organic matter content of F₁ increased by 0.70% and 14.90% respectively compared with F_CK. In the mature stage, the stem weight, spike weight and above ground dry matter weight of F₁ increased by 15.80%, 22.40% and 11.35% respectively compared with F_CK. The amount of biochar base fertilizer treatments F₂-F₄ are 570.00 kg/ha, 540.00 kg/ha and 510.00 kg/ha, respectively. That is to say, the amount of fertilizer input can be reduced by 5%-15% for 30.00 kg/ha, 60.00 kg/ha and 90.00 kg/ha, respectively. There was no significant difference between the yield of silage maize in F₂-F₄ treatments reducing fertilization with F_CK, which played a role in reducing fertilization. The yield of F₁ silage maize reached maximum, and the silage maize yield of F₁ increased 16.67% than F_CK.