Recently due to the impact of the pandemic，online teaching was adopted on a massive scale in colleges and universities across the country. In this paper，some experiences，including communication forms，advantages of online teaching，and ideological teaching etc，are concluded from the teaching practices of online college physics，and difference and connection between online teaching and classroom teaching are explored. Online teaching has become a parallel method or an auxiliary means of classroom teaching. In the long term，the in-depth thinking of the online teaching practice can provide valuable ideas for further improving the teaching effect of college physics.