This thesis discusses the effectiveness of using diction chain technique to teach students particularly in producing descriptive text in writing. The background of this research is the important of mastering writing ability especially at the tenth grade of MA Darul Ulum Semarang in the academic year of 2015/2016. They have some problems in writing. The students couldn’t write well because of their limited vocabulary and its meaning. They must learn to write more and add their unfamiliar vocabulary and its meaning. The diction chain technique can be helpful to increase students’ activeness and improve their ability in writing. This research answered the following question: How is the effectiveness of using the diction chain technique to teach writing on descriptive text? The purpose of this research is to investigate the effectiveness of using diction chain technique to teach writing of descriptive text at the tenth grade of MA Darul Ulum Semarang in the academic year of 2015/2016. The method of this research was an experimental study. The data was obtained by giving test to the experimental class and control class. The subjects of this research were sixty students which were divided into two classes namely X A as experimental class and X B as control class. The experimental class was taught by using diction chain technique, then the control class was taught by using conventional method (without using diction chain technique). The instruments to collecting data were test and documentation. There were pre-test and post-test in this research. Average score of post-test for experimental class was 74.0 while the average score of pre-test was 62.5. Meanwhile, the average score of post-test for control class was 65.16 while the students’ average score of pre-test was 61.16. It showed that the mean of experimental class was higher than control class (74.0 > 65.16). On the other hand, the test of hypothesis the ttable was 1.671 by 5% alpha level of significance and dk=30+30-2= 58. tcount was higher than the critical value on the table (3.083 > 1.671). The hypothesis was accepted. The result of the research shows that there was a significant difference in students’ writing ability on descriptive text between students who were taught by diction chain technique and students who were not taught by diction chain technique at the tenth grade of MA Darul Ulum Semarang in the academic year of 2015/2016.