The professional development and maturity of English teachers at vocational colleges is a long-term process, which can be generally divided into three periods, namely, teachers of new hand, experienced and expert level. Different professional qualifications are presented in the three periods. To evaluate their professional qualifications, their professional features and cultivation principles should be clarified which consist in professional qualifications, practice probe, cooperative development, reflection and the process of continuous progress. During the three periods, English teachers at vocational colleges have presented various needs for professional qualifications in terms of career values, professional knowledge, job capacity structure, technical method, managing and guiding students’learning, reflective quality and building learning community. It must be treated and cultivated respectively for the teachers in order to promote their healthy and sustainable professional developments.