This study carries out a declarative survey research designed to ascertain nursing informatics competency, job satisfaction and nursing performance of nurses and investigates the influence of nursing informatics competency on job satisfaction and nursing performance. The research was performed with 274 nurses who have been working for at least 6 month in P national university hospital in Y city, during the 30-day period of 15th October 2014 to 15th November 2014, using a questionnaire composed of questions on nursing informatics competency(30 items), job satisfaction(20 items), and nursing performance(23 items). The collected data underwent descriptive statics, t-test, ANOVA and Scheffe'test. Pearson correlation coefficients were also obtained and a stepwise multiple regression was performed by the SPSS WIN 19.0 program. The regression coefficient is positive between nursing informatics competency and conducting an information search(${\beta}=.20$, p=.012), in the case of job satisfaction,; It was also positive between nursing competency and computer related information management(${\beta}=.19$, p=.011), perception of informatics(${\beta}=.17$, p=.010), conducting an and information search(${\beta}=.17$, p=.004) in the case of nursing performance. We conclude that, in the nursing process, if nurse do their best to accomplish their tasks and strive to increase the productivity and efficiency of nursing tasks, they will achieve the organization's goals and balanced development.