The author designed a questionnaire,emailed and interviewed thirty advanced L2 learners who work as L2 lecturers in a university to get a survey on the processing of fossilization in their foreign language learning and teaching from the causes of purpose of learning,teaching tasks and other factors involved.All of the subjects thought that their command of the target language was not as good as a native speaker’s of target language in many aspects.That is,there existed fossilization among them.However,most of them agreed that their command of the target language was adequate for their professional and communication needs.Results also suggest that fossilization can be conscious to this group of L2 learners;it is deeply related with the L2 learners’ motivations;it can be affected by personal features such as ages,learning styles and teaching tasks;it is changeable and unpredictable; and it is difficult to eradicate.