In order to study the effect of soil texture and water content on nitrogen mineralization of biochar-based fertilizer, an indoor incubation and field experiment were conducted to study the characteristics of nitrogen mineralization under different soil textures (sandy loam, silty loam, clay) and soil moistures (80%, 60%, 40% of SMC). The results showed that the mineralization potential of the sandy loam was the highest, followed by clay, and silty loam was the lowest; The mineralization potential was in an order of 80%SMC>60%SMC>40%SMC for silty loam, 60%SMC>80%SMC>40%SMC for sandy loam and clay, the maximum nitrogen availability were 34.12% for silty loam, 56.31% for sandy loam, 41.14% for clay, respectively. The nitrogen availability of biochar-based fertilizer in single season under field conditions under three soil types the sand loam clay were 50.61% for silty loam, 32.27% for sandy loam and 34.29% for clay.