Disclosed are a high-grade privacy 
smart phone and a method for protecting private information of the high-grade privacy 
smart phone. The 
smart phone is composed of a 
radio frequency processor, a base-band processor, a first 
application processor, a second 
application processor, a display controller, a display module and the like. 
Wireless communication operation is carried out on the base-band processor. A first 
operating system in the first 
application processor is mainly used for 
processing multimedia application and the like with low privacy requirements. A second 
operating system in the second application processor is mainly used for 
processing personal issues with high privacy requirements. The first 
operating system and the second operating 
system are isolated from each other and form subsystems. Meanwhile, through hardware setting, third-party 
software can not be installed on the second operating 
system after the second operating 
system leaves a factory, or even, 
firmware upgrade can not be carried out, and therefore the second operating system becomes a 
closed system. According to the protection method, the first application processor and the second application processor which are independent of each other are used for 
processing the private personal issues and the 
multimedia application respectively.