This study aims at proving the effect of using memorial strategy on learners' vocabulary memory, presuming the need of a strategy in vocabulary learning. The main results of this research were as follows; Firstly, post immediate and delayed tests were conducted in order to measure short term and long term memory of experimental group with students who used vocabulary learning strategies and the control group with students who did not use special vocabulary learning strategy. The results of post immediate test were high in the experimental group in the first, second, and third experiments, but the differences of average between two groups were not significant. However, post delayed tests showed that the average of the experimental group was higher than that of control group and the differences of the average were significant. This confirmed that use of vocabulary learning strategy was more effective in learners' long term memory. Secondly, use of the strategy of connecting associational words did not have significant effect in short term memory, but it was very positive in long term memory. Thirdly, the strategy of making sentences was not effective in short or long term memory. Consequently, this research provided suggestions that using vocabulary learning strategy on learning vocabulary was effective, thus highly recommended in Korean language education.