Abstract: To seek the method of reducing fertilization in field and verify the practical application effect of the mixture of biochar and pyroligneous, three plots experiment on‘Tobacco K326’was conducted in one year, to study the effect of mixture of biochar and pyroligneous, and reducing fertilization on dynamic change of soil. The results of Yongren County showed that: compared with reducing conventional fertilizer, the mixture of biochar and pyroligneous under reducing fertilization could improve the sustained-release effect of nitrogen and potassium, and enhance the activity of phosphorus. The results in Yaoan County and Wuding County showed that compared with the normal fertilization with biochar and pyroligneous, the mixture had better release and excitation effect under reducing fertilization, and the advantage was obvious at reducing fertilization 10%-20%. Therefore, the method of reducing fertilization combined with the mixture of biochar and pyroligneous may be an effective one to reduce the amount of chemical fertilizer.