Based on the description on the background of the problem, that there are many that affect teacher performance. The results of the analysis of the Model of Organization Behavior's Integrative Model proposed by Colquit, Lepine, and Wesson which asserted that the individual outcomes considered to influence performance consisted of: job satisfaction, stress, motivation, trust, justice and ethics, and learning and decision making. And The formulation of the problem in this study is there any influence of work motivation on the performance of teachers SMK Medan City. The purpose of this study is to determine the magnitude of theinfluence of work motivation on the performance of teachers SMK Medan City. The research was conducted at 14 SMK Negeri in Medan city, there are SMKN 1, SMKN 2, SMKN 3, SMKN 4, SMKN 5, SMKN 6, SMKN 7, SMKN 8, SMKN 9, SMKN 10, SMKN 11, SMKN 12, SMKN 13, SMKN 14.The population of this research is Vocational High School (SMK) teacher in Medan city both public (civil servant) and private (Non PNS)which is 4,379 people with 367 samples taken by Slovin formula.The research instrument is a questionnaire with Likert scale.Research data is processedand analyzed by simple regression analysis.This simple regression analysis begins by testing the requirements analysis including normality test, linearity test and regression significance. The results of this study indicate that the influence of Work Motivation on Teacher Performance SMK Medan City of 5.1%, while the rest influenced by other variables outside the variable in this study.