Assessment of employee performance is important in improving company performance. Performance appraisal takes into account factors that support employee performance in accordance with the aspects reviewed. Usually performance appraisals are carried out only by direct supervisors. The existence of differences in the results of the assessment of superiors with perceived employee perceptions, often results in employee dissatisfaction. Performance appraisal will be better if it involves more than one assessor. A 360 degree feedback method is a method of assessment by involving superiors, peers, and self assessment. Integration of 360-degree feedback methods and analytical hierarchy process (AHP) are used to improve assessment results. The application of this method was carried out on nurses in the care ward of one mental hospital, involving 52 people, consisting of 12 superiors and 40 employees. The results show that the priority factors that influence nurse performances are work competency factors. There is a difference in the value of the gap between the assessment of superiors and employee ratings. The method integration has proven to have reduced the assessment gap level, so that the assessment results will be better.