First of all, I would like to express my sincere gratitude to my supervisor, Prof. E. Cambria. It is my great fortune to have the opportunity to pursue a Ph.D degree with his guidance and assistance. Without his support, I would not continue my study and come to the final. Next, I would like to thank Dr. Iti Chaturvedi and Dr. Soujanya Poria for their inspiring discussions and assistance during my PhD study. Specially thanks to Dr. Haiyun Peng and Yukun Ma, who are senior PhD students of Prof. Cambria, for helping me to start the exploration of sentiment analysis. This PhD was the most unforgettable experience of my life. I am really grateful to all my friends who cheered me up in difficult moments and shared my happiness when I made progress, including