Physics courses are difficult. Students can not clearly realize how and what they have done when learning. Teachers also do not know and can not help them. We concluded the characteristics of learning new knowledge based on our experiences, and then propose a learning strategy named Learning Notes Method. This method asks students to reorganize and write down what they have learned after class. If the students can do it, that means they learned well. If not, the teachers could find out how and what the students learned according to their notes. The notes could be taken as a portion of students' knowledge. If they forget in the future, they can recover by reading their notes. Hence, students could have high learning performance with Learning Notes Method.