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Knowing axial ultimate bearing capacity of a structure is essential forconstruction of building, bridges and other huge structures. Moreover, knowing theeffect of diameter change is crucial in the ultimate load carrying capacity of piles andthe soil properties. The purpose of the paper is to investigate the axial ultimatebearing capacity of the piles at different diameter and to draw the t-z and q-z curvesof the skin friction and end bearing capacities of the load resistance respectively,moreover to study the axial ultimate load carrying capacity of pile in homogenoussoil layer and multi soil layer. The methodologies applied to evaiuate the capacity aretheoretical calculation using the static axial load and the ALLPILE softwareanalyzing results. The result obtained from the model example numerical calculation using thestatic analysis for 400mm diameter 1369.7 kN and its settlement 8.lmm and when itapplied to ALLPILE result 1722.06 kN and its settlement software result 7.46 .Andthe big diameter 800mm theoretical result 2965.6 kN and settlement 11.57mm andusing the sofiware result 3440.6 kN and settlement 8.27mm. This shows that the pileshaving large diameter have higher bearing capacity and relatively low settlement dueto the increasing surface area of the pile shaft contact with soil And its more safe theresult since the ALLPILE software result was higher than the theoretical calculationof using the static analysis The skin friction resistance carries more load than the end bearing resistancebecause of the increase in the surface area of the pile shafi to resist the load. The skin friction resistance in multilayer soil of sand, sofi clay and stiff clay is the least,moderate and higher resistance of load carrying capacity respectively. And the end bearingcapacity is also moderately increasing with increasing the diameter.