Background: -In middle and low income countries it is believed that three in four persons withrnmental disorder do not receive appropriate treatment. To address this extensive unmet mentalrnhealth need in low-income countries. World Health Organization (WHO) recommendsrnintegration of mental health service into primary health care level that is providing mental healthrnservices which involve diagnosing and treating people with common mental disorders within therngeneral framework of available health services. Ethiopia implemented this program based onrnWorld Health Organization (WHO) scale up program called mental health gap action programrn(MH-GAP).rnObjective: - The objective of this study was to assess integrated mental health service adoptionrnstatus and extent of implementation in primary health care units in Addis Ababa, Ethiopia inrn2017.rnMethods:-Facility based cross-sectional study was conducted and subjects were selectedrnrandomly using proportional size allocation among health care workers in selected health centersrnin 2017. The total sample size for the study was estimated by single proportion populationrnformula and total sample size was estimated to be 422.Data was collected from selectedrnparticipants using self-administered questionnaires. Epi data 3.1 was used to enter and clean therndata. Stata 14.1 was employed for data analysis. Descriptive analysis percentage and summaryrnmeasures were conducted for adoption status and implementation level of integrated mentalrnhealth service. Bivariate and multivariate logistic regression was calculated to examinernassociation between general characteristics of respondents, health care providerâ€™s factors andrnadoption status of primary health care providers.rnResult:-More than half of respondents (61.69%) 238 of health care providers were found to bernunder mean score or having poor status of adoption. Majority of respondents 236 (58, 7%) hadrnstated that there were poor implementation level of mental health integration in their facility.rnWork experience more than 11 years [AOR: 12.34.95% CI :( 3.76- 40.56)], pre -servicerntraining[AOR: 2.1.95%CI: (1.249 -3.533)], Presence of discussion with colleagues or higherrnsupervisor [AOR: 1.82. 95%CI :( 1.066- 3.068)], having role or responsibility to diagnosis andrnassessment of mental disorder cases. [AOR: 1.93.95%CI :( 1.021 -3.683)]have found to berninfluencing factor for adoption status of integrated mental health service.rn2rnConclusion and Recommendation: -Status of adoption towards mental health integrationrnamong majority of primary health care providers is poor. The influencing factors for adoptionrnstatus of integrated mental health service in primary health care units are work experience, preservicerntraining, having a role or responsibility to diagnosis and assessment of mental illness,rnpresence of discussion with colleagues and supervisors in the facility. Majority of primary healthrncare providers are indicated that there is poor level of implementation in the primary health carernunits.rnMinistry of health and health science colleges should consider pre-service training to severalrnfield of study. Mental health global action implementers should facilitate consistent support andrnsupervision after in-service training. In addition several interferences should be used to changernawareness and attitude of health workers towards mental health service integration.