The purpose of this study is to investigate the relationships between trainee teachers' images of teaching and teachers, their self efficacy, and their self-evaluation of their teaching practice, paying special attention to the trainee teachers' desire to become teachers. The survey was conducted with 130 trainee teachers before and after teaching practice. Major findings of the study are as follows: (1) Trainee teachers who wanted to be teachers both before and after teaching practice had images of teachers as being more hard-working and industrious and had higher self efficacy than those trainees who did not want to be teachers either before or after teaching practice; (2) Trainee teachers who came to want to be teachers after teaching practice considered teachers as facilitators of learning after teaching practice; (3) Trainee teachers who wanted to be teachers both before and after teaching practice evaluated themselves more highly on their school lesson practice skills than those who lost their desire to be teachers after teaching practice; (4) Among trainee teachers who wanted to be teachers both before and after teaching practice, those who had developed a stronger desire to be teachers showed more positive self-evaluation in relation to lesson planning and preparation. Based on these results, the data have been carefully examined and discussed. Some implications are presented in order to make teaching practice more meaningful and productive