The application of the digital I&C in NPPs improves the human machine interfaces in the control room,which also brings many new challenges in human machine interaction.In order to reduce the impact of the computerized HMI on operators,some strategies are presented based on the characteristics of the HTR-PM from the point view of a HMI designer.In the control room,besides the computerized HMIs,the spatially-dedicated continuously visible(SDCV) displays,such as traditional mimic displays and alarm tiles are included,which helps the operators keep big picture of the plant in mind.According to the preliminary results of the verification on the V&V platform,the traditional SDCV displays can help reduce the impact of the computerized HMI on operators,such as key-hole effect,the interface management issue,etc.,which will support the operator better.