原认识是指学生在接触科学知识前,对现实生活现象所形成的经验型认识.原认识的存在将对物理教学产生不利影响,为纠正和克服其不良影响,就需从不同角度,通过不同的实例,并利用演示试验增强学生对物理现象的感性认识,力图让学生客观科学的理解接受正确知识,提高物理教学效果. The original cognition refers to the experience-based understanding of the real-life phenomenon before the students are exposed to scientific knowledge. The existence of the original cognition will have an adverse effect on physics teaching. In order to correct and overcome its adverse effects, different perspectives must be adopted. Examples, and the use of demonstration experiments to enhance students’ perceptual knowledge of physical phenomena, trying to allow students to objectively and scientifically understand the correct knowledge and improve the effectiveness of physics teaching.