Sex crimes against minors cause serious harm to children. To prevent and punish such crimes，an effective criminal punishment is one of the critical measures among others. By analyzing the judicial statistics in last 5 years of the People’s Court of Haidian District in Beijing，the research finds some common characteristics of these sex crime cases，which include the gender and age of victims and criminals，the role of guardians，the method and possible locations of the sex crimes etc. With the findings，we can adapt laws and policies，as well as adopt more targeted measures to reduce the risk of children being sexually assaulted. Restricted by the not-so-developed criminal law in this theme and lacking supporting measures，the criminal punishments to several kinds of sex crimes against minors are not matching the serious consequences，and the relief for victims are not so sufficient. Moreover，supplementary measures such as community corrections are not carry out effectively. For example，some criminals become recidivists due to sexual psychological disorder or other mental illnesses，however，they received no proper modification therapy after their first offense. It’s necessary to promote a more systematic protection framework，with join forces of law and policy，as well as supportive social measures，to protect children from sex crimes.