This study aims to identify and explain about the condition of motivation and employee performance and how motivational variables simultaneously and partially influencing the employee performance, also the dominant variable that influencing employee performance at PT Elsiscom Prima Karya, Surabaya branch. This study uses an explanation (explanatory research) methods. To Analyze the data, descriptive statistical analysis and inferential statistical analysis is used in this research which processed using SPSS version 15 for Windows. The results of inferential statistical analysis for simultaneous testing showed that the variable Needs for Existence, Needs for Social Relationship and Needs for Growth significantly affects the variable of Employee Performance which is known from the value of the F test 24.154 and the value of significance 0.000 (P<0.05). Also Needs for Existence with probability of 0.006 (P<0.05), Needs for Social Relationship with probability of 0.002 (P<0.05) and Needs for Growth with probability of 0.012 (P<0,05) which shows that there is partially significant of influence on Employee performance. From the three variables, it is known that the variable Need for Existence has the highest beta value of 0.501 which means the variable Needs for Existence is dominant variable influencing the employee performance.