The major problems of this study are how to develop the students’ speaking skill dealing with accuracy, fluency and comprehensibility, and how to motivate the students to speak English so this research is conducted to find out weather of guessing game technique effective to improve the speaking skill of the seventh grade students of SMPN 3 Balusu. In this research the researcher apply quasi experimental method that apply a pre-test and post-test design. It involves two groups; the experimental group guessing game technique, as the control group Q&A technique, lecturing way. Both of group are given pretest and posttest. The population is the seventh grade students of SMP Negeri 3 Balusu. It consists of three classes. The researcher uses cluster sampling in both class in this research. They consist 20 (twenty) students for experiment and 21 (twenty one) control group. The result of the data analysis showed that the students’ spreaking ability improved, it shows that the speaking ability of the seventh grade students of SMPN 3 Balusu improve through guessing game technique. Moreover, the response to questionnaire also shows that most of the students’ interest to the teaching guessing game uses in the classroom. In short, using guessing game in speaking is effective to improve the speaking ability of the seventh grade students of SMPN 3 Balusu.