In order to evaluate the effects of combined application of humic acid and reducing fertilizer nitrogen on thephysical and chemical properties of soil for realizing the rational use offertilizer，the experiment was conducted to study the effects of combined application of humic acid and nitrogen fertilizers on the physical and chemical properties of soil in yellowcinnamon soil region of Southern Henan.Six treatments were setup:no N fertilizer，conventional fertilization，singlehumic acid(3 000 kg·hm -2)，humicacid(3 000 kg·hm -2)+ conventionalfertilization，humicacid(3 000 kg·hm -2)+conventional fertilization and nitrogen reduction15%，humicacid(3 000 kg·hm -2)+conventional fertilization andnitrogen reduction30%.The results showed that combined application of humic acid and nitrogen fertilizers effectivelyimproved the physical and chemical properties of soil.Among them，the effect of conventional fertilization and reducing nitrogen 15%+humic acid 3 000 kg·hm -2treatment was the best.The soil bulk density of T5 treatment was the lowest，which was significantly lower than that of othertreatments(0.73%～4.91%)(P<0.05)；However，the soil organic mattercontent，nitrogencontent，available phosphorus content and available potassium content of T5 treatment were thehighest.Compared with conventional fertilization，soil organic matter increased by4.58%，soil total nitrogen and alkali -hydrolyzablenitrogen content increased significantly by 21.76% and9.82%( P<0.05)，soil available phosphorus increased by2.68%，and the content of soil available potassium increased by1.84%.While there was no significant difference in pH value amongdifferent treatments( P>0.05).Therefore，the conventional fertilization and nitrogen reducing 15%+humic acid is the bestfertilization mode in the studyarea.This mode can be benificial to resource saving and environment protection and high -quality development ofagriculture.