The interaction of electricity is one of the basic characteristics of smart grid, for interactive methods of using electricity and the information security risk and demand research. First of all, from the risk perspective, the interaction of electric power information security and wide area environment using power mode under the comparison qualitative, focuses on the differences in the objective conditions. The two in the threat generated subjective motive and the consequences of the accident etc.. On this basis, combined with the characteristics of the interaction system with electric business process and high volume, starting from the confidentiality, integrity and availability of information security requirements refine the usability evaluation, key management and abnormal behavior detection such as the 3 aspects of difficult problems.