The aims of the thesis are; (1) to reveal tongue twisters can improve thestudents’ ability to pronounce fricative consonants; (2) to reveal tongue twisterscan improve the students’ ability to pronounce long vowels (3) to reveal theproblems related to the implementation of tongue twisters in teachingpronunciation.This research is classroom action research dealing with the implementationof tongue twisters to improve the students’ ability to pronounce fricativeconsonants and long vowels. This research was conducted at the eighth grade ofSMP Ma’arif 1 Ponorogo, East Java Province. The data are collectedquantitatively (test) and qualitatively (observation, interviews, document analysis,test, record and photos). Quantitative data are analysed by using descriptivestatistics, while qualitative data are analysed through three steps which areproposed by Huberman, those are data reduction, data presentation andconclusion/verification in conclusion.The finding shows that the implementation of tongue twister as a teachingtechnique could improve the students’ pronunciation of fricative consonants andlong vowels. The improvement of students’ pronunciation could be seen from themean scores in pre-test, test 1 and post-test. In the scale of 100, the mean score offricative consonants in pre-test was 25. It improved to 58 and 74 in test 1 andpost-test successively. The mean score of long vowels were 31. It improved to 53and 73. Meanwhile, the problems occurred during the implementation of tonguetwisters could be seen from the result of observation during the teaching andlearning process. The problems came from the researcher as the teacher, theassessment, the students and the tongue twisters as pronunciation teachingtechnique. After the implementation of tongue twisters, the students wereinterested in learning, looked confident, more active in the class, and paid theirattention to the material. Therefore, it can be concluded that tongue twisters is anappropriate technique for teaching speaking, especially pronunciation.In conclusion, the result of this research implies that tongue twisters is aneffective technique to improve the students ability to pronounce fricativeconsonants and long vowels. However, there is needed teacher’s monitor and wellpreparation so that the teaching and learning pronunciation run effectively toavoid the problems that may be occur during teaching and learning process andthe material can be delivered well.Keywords: tongue twisters, fricative consonants, long vowel, CAR