The objective of this research is to find out the empirical evidence of the effectiveness of song technique in improving students? vocabulary. The writer used an experimental method. The population of this research was the students of SDN Palmerah 25 Pagi West Jakarta. The samples were taken from two classes of the third grade. The writer took 25 students for the samples in experiment class and 25 students in control class. In this research the treatment was done for six times and was ended with post-test by the writer. The data that the writer got from the research were using the t-test formula. From the result of computation of the data, it was found the t observed 2.62 and t table 1.68. Because to > tt , it means the Ho is rejected and the Hi is accepted, so it can be concluded that the use of song technique in improving students? vocabulary is effective.