The Health Extension Program which has been implemented in Ethiopia since 2005 is launched with thernview of taking healthcare services closer to the local people. This program aims to improve access andrnequity of primary health care through provision of essential health interventions at the village andrnhousehold level. It focuses on sustained preventive health actions and increased community awareness. Inrnthe implementation of the program, however, different challenges are limiting the achievement of itsrnobjectives. In light of this, this study was conducted to investigate the challenges of Health ExtensionrnProgram (HEP) implementation in Berek Wereda of Oromiya Region. In doing this investigation,rndescriptive research design was followed. Subjects of the study were Health Extension Workers (HEWs),rnprogram beneficiaries or the community and Wereda Health Bureau Officials. In the study, two types ofrnsampling techniques were used. Using purposive sampling method, four Kebeles of the study sites werernselected. One hundred thirty- eight community participants were selected using random samplingrntechnique. Beside these, seventeen HEWs were randomly selected and participated in the study. The datarngathering instruments employed in the study were questionnaire, interview schedule, key informantrninterviews, focus group discussion and site observation. The study involved strict respect for informedrnconsent, voluntary participation and confidentiality. The findings of the study indicated that there arernimprovements in the accessibility of primary health care services to the community. However, differentrnchallenges are limiting the proper implementation of the HEP in the study Wereda. Attrition of HEWs,rnlow budget allocation, irregular and insufficient supply of medical logistics and drugs, weak infrastructurernfacilities, poor working conditions for HEWs and insufficient community participation, are the majorrnchallenges identified in the study. Based on the findings of the study, the research recommended thernstrengthening of infrastructure facilities, allocation of sufficient budget, sufficient and regular supply ofrnmedical logistics, office materials and drugs, creation of better working environment for HEWs andrnpromoting community participation. It is also important to consider the development of local resourcerncapacity and strengthening better coordination among all stakeholders of the program for betterrnimplementation of the program in the study area