The effects of citrate acid-soluble potassium fertilizer on rapeseed growth and soil potassium were studied with the pots experiment.The results showed that the citrate acid-soluble potassium fertilizer could promote the growth of rapeseed and increased the content of soil potassium.The biomass and potassium accumulation of rapeseed were increased and then decreased with the increase of application rate of potassium-silicon mineral fertilizer when the potassium rates was 0.75-3.00 g K2O/pot (0.075-0.300 g/kg).The biomass and potassium accumulation of rapeseed were the highest with potassium rates of 2.25 g/pot.Compared with treatment of no potassium,rapeseed biomass was 70.6% and the total potassium accumulation increased by 3.08 times.The potassium content of rapeseed was increased with the increase of application rate of potassium fertilizer,nevertheless,the nutrient utilization efficiency was opposite.The content of soil available K and slowly available K was increased with the increase of application rate of potassium fertilizer.Comprehensive results showed that the optimum citrate acid-soluble potassium fertilizer application was 1.50-2.25 g/pot.Under the condition of this experiment and the same potassium nutrient supply,the biomass,potassium nutrient content,potassium accumulation nutrient fertilizer utilization and soil potassium content of citrate acid-soluble potassium fertilizer of rapeseed was higher than water-soluble potassium fertilizer,indicating that citrate acid-soluble potassium fertilizer can replace water-soluble potassium fertilizer from the perspective of potassium nutrient supply.