Computer has become part of our life and it plays an important role in our policy, economy,society and also people’s daily life. Computer security becomes a problem that everyone focuses. Computersecurity refers to the safety of computer resources. It is the problem that every user must face and solve toensure the computer not suffering harzards and threats. And it also ensures the hardware and software incomputer system operating stably and practically. The paper analyses the common issues concerning aboutsecurity of personal computer,and proposes appropriate solutions.