Nitrogen supply of paddy soils under contamination is important for crop production and plant bioremediation. Pot experiments were carried out to study N supply characteristics and its influencing factor of 21 types of paddy soils under two spiked-cadmium levels. The results showed that the total inorganic nitrogen (TIN) contents ranged from 1.42 to 70.40 mg/L (mean at 16.76 mg/L), , in which NH4+-N and NO3--N amounted to 62.5% and 33.7%, , respectively. In comparison to control treatment (fertilizion with NPK without Cd addtion), , Cd treatment decreased soil solution TIN contents for most types of paddy soils, , which was mainly caused by the decline in NH4+-N contents. Changes of soil solution NO3--N contents with Cd contamination were soil type-dependent. CCA-based variation partitioning analysis (VPA) indicated that solution inorganic nitrogen supply of paddy soils was most affected by Cd contamination (40.38%), , less affected by soil type (6.51%), , and least affected by fertilization (0.05%). Soil pH, , CEC and texture were important factors influencing inorganic nitrogen supply of paddy soils under Cd contamination, , among which soil pH was the foremost factor for soil solution ammonium.