In order to study the effects of the particle form and dosage of activated humic acid fertilizer on the growth anddevelopment of apple tree seedlings，the soil physical and chemical properties and the fertilizer utilization rate，a total of8 treatments were designed through the pot experiment of apple treeseedings，including no fertilizer(CK)，conventionalfertilization(CCF)，large particle activated humic acid fertilizer at 100% applicationrate(SAF1)，large particle activatedhumic acid fertilizer at 80% application rate(SAF2)，large particle activated humic acid fertilizer at 50% applicationrate(SAF3)， 100% application amount of powdered activated humic acid fertilizer(PAF1)，80% application amountof powdered activated humic acid fertilizer(PAF2)，50% application amount of powdered activated humic acid fertilizer (PAF3).The plantheight，stem diameter，chlorophyllcontent，photosynthetic characteristics，biomass，fertilizerutilization rate of apple tree seedings，and soil available nutrients content under different treatments were investigated.The results showed that compared with CCF treatment，SAF1，SAF2 and PAF1 treatments significantly increased plantheight，stem diameter，new treetop length，dry matter weight，photosynthetic intensity and soil available nutrientscontent；the chlorophyllcontent，net photosyntheticrate，stomatalconductance，transpirationrate，plant dryweight，nitratenitrogen，available phosphorus and available potassium of SAF3 and PAF3 treated with reduced fertilization werenot significantlydifferent.In addition，the average utilization rate ofnitrogen，phosphorus and potassium in the treatmentof large particles activated humic acid was40.7%，20.6% and46.2%，respectively，which was12.7%，32% and 38.7%higher than that of powdered activated humic acidfertilizer.Under the condition of reducing the amount offertilizer，80% application amount treatment SAF2 had the best effect on promoting the growth of apple tree seedings and improving soilfertility，and it was significantly better than conventionalfertilizers.Therefore，large particles activated humic acid fertilizerhad significant effects on reducing fertilizerapplication，increasing nutrient utilization rate，promoting the growth of appleseedlings，and increasing soilfertility，and had a great potential for large -scale promotion and application.