In order to prepare a slow release fertilizer that can be used for rice sowing and fertilization together in theexperiment，methylmethacrylate(MMA)and butylacrylate(BA)were used as the mainmaterials，small amount ofcarboxymethylcellulose(CMC)and nano-SiO₂ were added as modified materials to prepare modified polyacrylate emulsion to wrap the fertilizer to achieve the slow release effect. The 25 ℃ hydrostatic dissolution rate method wasadopted，combinedwithinfrared，electronmicroscopy and other analytical techniques，the nutrient release law of modified polyacrylate slow release fertilizer prepared with different raw material ratio and three coatingamount(10%，15%，20%)in water was explored. The results showed that the sustained release effect was the best when the mass of CMC accounted for 5% of solidcontent(BA+MMA)and the coating amount was20%，and the cumulative nutrient release rates on 1 and 28 days were 0.5%and63.8%，which werelower than 15% and80%，respectively. Inaddition，the potting experiment was carried out using this specification of self-made slow releasefertilizer，the content of total nitrogen and total phosphorus in potted surface water and the growth status of rice were compared under different fertilization rates and fertilization methods. The results showed that when the slow release fertilizer application rate was70% of the traditional fertilizationamount，compared with the traditionalfertilizationmethod，the total nitrogen and total phosphorus losses werereduced by about 56.4% and88.9%，respectively， and the rice production was effectively increased.