Teachers participate in the online learning is always accompanied by a certain amount of motivation, and teachers' motivation affect the effectiveness of online learning. Through the questionnaire of the teacher who come from three middle schools of Changsha about their online learning motivation, we found that: the structure of middle school teachers’ online motivation is mainly composed of emotional experience, external motivation, teachers' professional development and amotivation; Overall, the motivation of teachers’ online learning is in the middle level, the professional development of teachers is the strongest motivation, the motivation of emotional experience is the second strongest motivation, external motivation is the weakest motivation; In the demographic variables, such as gender, age, seniority, family, education, rank, teaching grade and subject are significant differences on variables; The movitaion of onling learning of new teachers are more inclined to pursue the occupation ability, and mature teachers' Onling Learning motivation is low, the motivation of expert teachers is to pursue deeper development. According to this,we put forward three suggestions : ensure teachers have enough time on online learning, and improve the utilization rate of the learning time; pay attention to teachers' individual needs; improve teachers’ online learning autonomy.