Based on CC2020 competency model,this paper constructs and studies the network security experiment teaching system in order to realize the learning of core knowledge of network security,the improvement of offen-sive and defensive skills and the cultivation of character.The virtual simulation experiment teaching platform and rain classroom platform provide the basis of information-based teaching and enhance the innovation of practical teaching.Combined with the current situation of students in our school,this paper puts forward detailed construc-tion measures from various angles and directions,such as teaching content design,experimental resources construc-tion,teaching strategy assessment and evaluation mechanism.The implementation of this practical course will have practical significance and reference value for cultivating innovative and practical talents in network security.