The Taihang Mountain Pediment Plain is one of the most important planting areas of summer maize in Hebei province.The 3414 experiments data which were conducted in this area in 2005～2013 was analyzed systematically to clarify the inherent soil fertility on summer maize yield，basic soil productivity contribution rate and yield response，and a boundary line analysis was used to evaluate the correlations between soil basic yield with soil organic matter，total N，soil available P and available K，respectively.The results showed the soil basic yield of summer maize in the Taihang Mountain pediment plain ranged from 3222～9672 kg/hm²，with an average of 6210 kg/hm²，and the soil’s basic yield contribution rate ranged from 32.2% to 99.7%，the average value was 71.7%.Within the range of summer maize basic fertility yield in the piedmont plain of Taihang Mountian，there were significant linear positive correlations between soil basic yield with fertilization yield and soil basic fertility contribution rate，respectively.For every 1000 kg/hm² increase in basic fertility yield，the fertilization yield of maize increased by 585 kg/hm²，and the soil’s basic fertility contribution rate increased by 6.5%. The yield response for N，P，and K fertilizer was 1614，909，and 802 kg/hm²，respectively.The boundary analysis showed the critical levels for soil fertility characters in this area were the soil OM 14.3 g/kg，soil total N 1.20 g/kg，soil available P 20.2 mg/kg，and available K 121.9 mg/kg，respectively.The soil available phosphorus and available potassium had a higher contribution rate to the basic soil fertility yield gaps than soil OM and total N，which indicate increasing the content of available phosphorus and available potassium is the key direction of soil fertility enrichment in this area.