The durability of the road flexural pavement structure is largelydetermined by the performance of each layer. One of these factors isthe strength and resilience of the subbase. Compaction inaccordance with applicable standards will produce roads with goodquality so that the road life is longer and there is less damage. Thepurpose of this study is to analyze the carrying capacity using CBR,the value of the field density with the sand cone test and thecorrelation of the CBR value and the Sand cone value of the B gradefoundation layer on the Tugu Munajah network. The researchmethod used is laboratory and field testing combined with adescriptive statistic approach.The results of the study indicate that the carrying capacity using theCBR amounted to 55.02% <60%, the density value field with sandcone test of 72.50% <90%. Correlation of CBR and Sand cone value atthe base layer (sub base course) is very strong at 0.998.