Learning Mandarin Chinese tones is a big challenge for English speaking learners. The average tonal production accuracy is reported to be about 70 percent for intermediate-level learners and 40 percent for beginning-level Chinese learners. The Chinese tonal proficiency significantly influences the learners' communicative effectiveness, including listening and speaking, but research often overlooks tonal production. This study proposed and tested a novel method of teaching English-speaking learners to pronounce Mandarin Chinese tones. This teaching method includes a Chinese tones bookmark, and a 30-50 minutes in-class training module. The research undertook five cycles of Design-Based Research (DBR) implementations with 31 public school students, adult learners, and Chinese teachers. Two audio recordings, one pre-training and one post-training, were collected and compared through the paired samples ttests. Interviews, surveys, and class observations were adopted to determine the participants' attitudes toward the training and the teaching model. The results revealed that the designed teaching method was effective to improve the tonal production accuracy of English speaking K-12 children and adult learners. In addition, the results indicated that the participants' attitudes toward the designed method were positive. This study contributes to the current Chinese tonal teaching repertoire and presents a flexible, practical method for teachers to use when instructing students on Chinese tones. iii Dedication This dissertation is dedicated to the memory of my father, Yingchun Shi, and my prior advisor, Dr. Patricia Obenauf. Although they were my inspiration to pursue my doctoral degree, they are unable to see my graduation. This is for them. Thank you to my academic adviser, Dr. Sam F. Stack, who guided me in this process and to my dissertation committee who kept me on track. I dedicate this dissertation to my husband, Patrick Yao, who survived my five-year study and research with taking much more family responsibilities and tolerating my unstable temper. For my mother, Zhuoxi Liu, who helped me in all things great and small, and made her way to attend my graduation ceremony from China. This dissertation is dedicated to my children, Allan, Ben, Caden, and Destiny, who managed themselves well throughout my Ph.D. study with less attention and support from their mother.