Proffestional employees turnover in agricultural research centers increasing in alarming rate. Adet agricultural research center was also one of those organizations that suffered from this high rate of employee turnoverr. The main purpose of this study was assessing employee turnover in Adet Agricultural Research Ccenter. To achieve this objective, both quantitative and qualitative research approaches were employed. Among the total number of 154 professional employees currently working in Adet agricultural research center, eighty eight employees were selected as a sample using simple random sampling techinique. Similarly, from the total of 138 ex-employees within five respective years, seventy nine ex-employees were selected using simple random sampling tequinique. Accordingly, questionnaires were distributed to 88 current employees respondents and 80 of them were filled the questionnaire and replied. In the same way, questionnaiers were distributed to 79 ex-employees. Out of 79 respondents, only 67 respondents filled out and replied the questionnaire. Also, twelve discussants who are assumed to have the same level of undersanding and closer academic level were purposively selected for focus group discussion for two rounds. Likewise ,two key informants were purpusively selected based on their understanding. The data was analyzed using descriptive statistics; percentage, frequency, and cumulative percentage using SPSS 23 version. The result of the study indicated that the factor that highly affects employee turnover were low in monetary reward. On the other hand, job disatisfaction is another major factor that highly initiates employees to leave the organization. As the finding of the study showed both current and ex-employees are not satisfied with their participation in the research center decision-making process. This is implies that dissatisfaction on organizational decision making process is an additional contributing factor that causes for employee turnover. Additionally, the result indicated that it is possible to minimize the rate of employee turnover though designing reward policies and applying the retention mechanism by encouraging employees to involve in decision making. To reduce the annual rate of employee turnover in agricultural research centers, a detailed and multi variable based study and a close discussion with the management body is very significant to be effective, productive and meet the aim of the research center