In this paper,researches on abundancedeficiency index(ADI)of soil available K for corn(SAKFC)and appropriate potassium fertilizer application rate(APFAR)conducted in China since the 1980s were systematically summarized.The results showed that the ADI of SAKFC in China had the decreasing trend in 30 years.There were considerable differences in their ADI of SAKFC in different regions,and the ADI of SAKFC for 90% relative yield(RY)of the complete nutrients treatment except potassium(TCNTEP)ranged between 75~215 mg/kg.Researches on ADI of SAKFC in China had many blank regions.Soil potassium deficiency for corn in China was common,and the abundancedeficiency levels of SAKFC focused on the comparatively high level 2 and 3,and the RY of TCNTEP were mostly between 80%～100%.For research on ADI of soil nutrient,the number of trial sites should not be too little,and the soil nutrient contents of trial sites should not be too centralized,and using extrapolating data for the highend and lowend of ADI should be careful and indicated.APFAR and the abundancedeficiency level of SAKFC were linear negative correlated.APFAR and the yield goal were linear positive correlated.When the PFUEICS was 50% and the target yield was 10.5 t/hm2,the APFAR for the SAKFC abundancedeficiency level 1~7 from high to low were K2O 0,44,88,132,176,221 and 265 kg/hm2,respectively.