【Objective】Phosphorus (P) is an indispensable nutrient needed for plant growth and development and P is deficient, especially in the red soil region of South China. However, the unsuitable application of P fertilizer results in low use efficiency of the fertilizer, ranging from 10% to 25% in the current season in the region. This could result in P surpluses in soils, and runoffs and is one of the important nonpoint source pollutions of aquatic habitats and other water resources. Thus, it is important to investigate a suitable P fertilization in the region to improve P use efficiency and sustain crop yields. 【Method】A field experiment was conducted at the Experimental Station of the Chinese Academy of Agricultural Sciences, Qiyang, Hunan Province, China. The effects of different phosphorus fertilizers (superphosphate, swine manure, calcium magnesium phosphate, monoammonium phosphate, diammonium phosphate), P application rates (conventional phosphorus application, phosphorus reduction 20%, phosphorus reduction 30%), and P combined with amendments (lime, calcium magnesium phosphate fertilizer combined with diammonium phosphate, or crop straw return) on phosphorus availability and crop growth in red soil were tested. 【Result】Of the different phosphorus fertilizers, swine manure induced the highest soil available phosphorus and aboveground biomass and P use efficiency in 2019. Also, under this treatment the crop yield in 2020 was significantly higher than that of other treatments. Compared with the control treatment, swine manure treatment significantly increased soil available phosphorus and aboveground biomass by 32% and 241%, respectively, in 2019, and by 73% and 510% in 2020. As P application rates decreased, the soil available P content was also significantly decreased. However there were no changes in rape seed yield, aboveground biomass, P use efficiency and phosphorus agronomy efficiency. Among them, 30% phosphorus reduction was the best treatment. Compared with a single application of calcium magnesium phosphate, the combined application of calcium magnesium phosphate and diammonium phosphate effectively improved crop yield, soil available phosphorus and phosphorus efficiency index to a certain extent. The treatment of calcium magnesium phosphate fertilizer + diammonium phosphate had the best effect on the crop yield, soil available phosphorus, phosphorus fertilizer cumulative use efficiency, phosphorus agronomic efficiency and soil phosphorus surplus. The addition of lime improved crop yield, soil available phosphorus and phosphorus fertilizer cumulative use efficiency , but did not reach a significant level as compared to superphosphate only treatment. There was a significant positive correlation between rape seed yield and soil available phosphorus. 【Conclusion】 From the above research results, we can conclude that the replacement of chemical phosphorus fertilizer by swine manure phosphorus could achieve the purpose of reducing application and increasing efficiency. Also the best amount of phosphorus fertilizer was a 30% reduction of conventional phosphorus application rate. The calcium magnesium phosphorus fertilizer as a P source should be applied combination with diammonium phosphate to supply P demand for crop growth in such weak acidic red soils.