The objective of this research is to examine the effectiveness of Kim’s memory game technique applied in teaching vocabulary mastery. In this research, the data was collected by using quantitative research through experimental research. The research was carried out in two groups; the experimental group and the control group. The data were collected through tests which were delivered into the pre-test and the post-test. The result of the research showed that using Kim’s memory game technique is effective in teaching vocabulary mastery. The mean score of post-test the experimental group (71.69) is higher than the control group (61.19). From the result of statistic calculation, it is obtained that the value of t-observation (to) is 7.004 and the degree of freedom (df) is 62. In the table of significance 5%, the value of degree of significance is 1.999. Comparing those values, the result is 7.004 > 1.999 which means t-observation (to) score is higher than t-table (tt) score. In other word, the Alternative Hypothesis (Ha) is accepted and the Null Hypothesis (Ho) is rejected. Therefore, teaching vocabulary mastery by using Kim’s memory game is effective.