Abstract—Android is a smart mobile terminal operating
platform core on Linux. But due to its open-source software
and programmable framework character, it leads the Android
system vulnerable to get virus attacks. This paper has deeply
researched from the Linux system security mechanism,
Android-specific security mechanisms and other protection
mechanisms. And on this basis, Android devices have achieved
closely guarded on normal state. So that attackers can not use
the kernel module or core library to get highest access
permission and be attacked. Meanwhile, to further strengthen
the security of Android devices, it enables them to properly
handle the high-risk threat. This paper also strengthened
intrusion detection system (HIDS) based on the host in order
to detect malicious software and strengthen the Android
system-level access control.