Abstract: This paper studied the core algorithm, typical application scenarios and application status of the domestic password (referred to as "national password"), solved the security scheme design and data transmission encryption problems in the system in combination with the actual requirements of the railway dispatching emergency command system, expounded the application of national password in the railway dispatching emergency command system in detail, and obtained the security architecture scheme, identity authentication scheme and data encryption transmission scheme of the railway dispatching emergency command system, which played an important role in maintaining the data integrity of the system, ensuring the information security and improving the security protection level.