Many schools used a conventional method in the learning process especially in English grammar teaching. Many students find difficulties when the teacher asked them to build sentences in the passive voice form. The students knew the rules of passive voice. However, they were confused to make sentences using the rules. It was because the teacher just gave the rules and students just received the rules without trying to conduct their own rules. After words, the aim of the research was to explain whether there was a significant difference of students’ understanding in passive voice simple past tense who were taught by using inductive instruction or not. The instruments, which were used to collect the data were documentation and test. The technique to analyze the data was t-test formula. The average of post-test in an experimental class was 78.846, which was higher than the average of post-test in a control class (68.462). The t-test showed that t count = 2.730 was higher than t table = 1.671. It meant that H1 was accepted and H0 was rejected. Since t count was higher that the t table , there was a significant difference in the achievement between students in class IX A, who were taught passive voice simple past tense by using inductive instruction and students in class IX B, who are taught without using inductive instruction.