【Objective】 Phosphorus is one of the most important nutrients for plant growth, and increasing application of P fertilizer has been an effective way to improve crop yield. However, plant available phosphorus is always relatively low in soil, because more often than not a large portion of phosphorus is bound to or reacted with iron and aluminum oxides/hydroxides. To solve the problem, one option is to insulate phosphate from soil by coating phosphorus fertilizer with polymer material. Fulvic acid (FA) is considered to be an effective conditioner for better phosphorus use efficiency, because owing to its specific physicochemical properties, it is ready to get complexed with metal ion, which in turn releases desorbed phosphorus in soil. However, so far little has been reported on coating diammonium phosphate and applying FA as its amendment. This paper addresses effects of coated diammonium phosphate (CP) in combination with lignin-based FA on wheat (Triticum aestivum L.) yield and soil nutrient supply intensity, in an attempt to provide a scientific basis for proper usage of P fertilizer. 【Method】 A pot experiment was carried out to explore effects of combined application of CP and FA on wheat yield, yield composition, chlorophyll content, plant height, SPAD, soil pH, and phosphorus use efficiency. The experiment was designed to have eight treatments, i.e. Treatment P (application of diammonium phosphate (DP) at 150 kg hm^-2 P₂O₅), Treatment P80% (application of DP at 120 kg hm^-2 P₂O₅, 80% of the rate of Treatment P), Treatment CP (application of coated DP at 150 kg hm^-2 P₂O₅), Treatment CP80% (application of coated DP at 120 kg hm^-2 P₂O₅, 80% of the rate of Treatment CP), Treatment P+FA (application of DP at 150 kg hm^-2 P₂O₅ plus FA) , Treatment P80%+FA (application of DP at 120 kg hm^-2 P₂O₅ plus FA), Treatment CP+FA (application of coated DP at 150 kg hm^-2 P₂O₅ plus FA), and Treatment CP80%+FA (application of coated DP at 120 kg hm^-2 P₂O₅ plus FA), of which the first two were set as control. 【Result】 Results show that wheat yields in treatments P+FA, CP and CP+FA increased significantly by 7.7%, 5.1% and 24.0%, phosphorus use efficiency by 9.14%, 9.74% and 17.00%, respectively, and economic benefit by 6.3%,1.1% and 22.5%, respectively, as compared Treatment P, whereas wheat yield in P80%+FA, CP80% and CP80%+FA increased by 10.6%, 7.2% and 4.8%, and phosphorus use efficiency by 19.88%, 18.53% and 11.54% as compared with Treatment P80%. However, economic benefit increased by 8.9% and 10.5% in Treatment P80%+ FA and Treatment CP, but decreased by 1.10% in Treatment CP+FA. Both of CP and FA improved soil available phosphorus during the whole wheat growth period. At the seedling stage when phosphorus was critical to wheat, soil available phosphorus increased by 16.9%~24.0% and 21.6%~40.1% in Treatments of P+FA and CP+FA and by 15.0% in Treatment CP as compared with Treatment P, whereas it increased by 8.7%, 26.1% and 23.7%, respectively, in Treatments P80%+FA. CP80% and CP80%+FA as compared with Treatment P80%. 【Conclusion】All the findings in this experiment demonstrate that application of CP in combination with FA as basal could significantly raise soil available phosphorus supply intensity at the critical period of wheat, and consequently improve wheat yield, phosphorus use efficiency and economic benefit as a result of their synergistic interaction. This practice has a great potential for large-scale extension to satisfy the increasing demand for controlled-release fertilizers because it is cost-effective and environmentally friendly. However, due to certain limitation of the pot experiment, a long-term field experiment and further studies should be done to explore synergistic interaction and mechanism of the application of CP and FA increasing yield and phosphorus use efficiency.