This research discusses the effectiveness of using pictures in the teaching vocabulary of seventh grade students of SMP Hasanuddin 5 Semarang in the academic year of 2016/2017. The background of the research was based on the phenomenon students’ difficulties in English vocabulary understanding. This research was intended to answer the following research question; How is the effectiveness of using pictures in teaching English vocabulary for the seventh grade students of SMP Hasanuddin 5 Semarang in the academic year of 2016/2007? Population of the research was seventh grade students of SMP Hasanuddin 5 Semarang in the academic year of 2016/2017. This research design was an experimental research. It was conducted into two groups; experimental group (VII D) and control group (VII B) which was choosen by simple random sampling technique. Experimental group was taught vocabulary by using pictures while control group was taught vocabulary without pictures. Instrument of the research were written test and documentation. There were pre-test and post test to collect data. From the result of analysis of normality test and homogenity test, it was known that both groups were normal distribution and have same variant. Another formula that was used to analyze the data was t-test. It was used to determine whether there was a difference between average score of experimental group and control group or not. Based on the data obtained, it showed that pre-test average score of experimental group was 86.15 and control group was 88.45. Meanwhile, the post test average of experimental group was 53.65 and control group was 43.97. Furthermore, it was obtained that tcount was 2.030 and ttable 2.006 for α = 5%. Because ttable was lower than tcount (2.006 < 2.030), Ho was rejected and Ha was accepted that there was a difference of the post test average score between experimental group and control group. Based on the result, it was concluded that using pictures is effective in the teaching vocabulary at the seventh grade students of SMP Hasanuddin 5 Semarang in the academic year of 2016/2017.