In recent years, biochar as a soil modifier has responded well in improving soil quality and crop yield. In this paper, the responses and feedbacks of soil physical and chemical properties, crop growth and yield to biochar application were summarized based on the comprehensive and latest review of biochar application effects. The results showed that: (1) The source, acidification, application years and application amount of biochar determine the change range of soil properties and crop yield after application. Generally speaking, as the application amount increases, soil bulk density decreases, soil porosity increases, soil hydraulic properties and infiltration performance are improved, and soil temperature also increases. (2) Due to the changes of soil physical properties, the biochar application eventually reduces the soil surface salt accumulation. The effect of biochar on soil pH depends on the difference of pH between biochar and soil. In addition, with the increase of biochar application rate, organic matter content increased linearly, while available nitrogen, available potassium and available phosphorus increase firstly and then decrease. (3) Suitable application of biochar can make crops grow better and yield higher. However, the excessive application amount is not economic, which increases the cost, and contribute less to the improvement of crop yield. The appropriate application amount of biochar are recommonded to be in the range of 10 to 40 t/hm². (4) In general, although the response and feedback of soil properties and crop growth to biochar application vary with experimental conditions, soil texture and crop type, and climatic conditions, most of the results confirm that soil properties and crop growth have positive responses to biochar application. In future, the scientific understanding and production practice of biochar application should be formulated according to local conditions.