At present，the crime of sexual assault on minors in Beijing not only shows a growing momentum，but also has some new characteristics，such as the diversification of criminal subjects，the networking of criminal means，the long latent period of crime，the prominent derivative crime and so on. This kind of crime not only seriously endangers the physical and mental health of minors，but also lags behind the first good standard established by Beijing in the new era and the goal of building a safe Beijing. Therefore，based on the latest trend of this kind of crime，the criminal policy of “being strict，serious and quick” needs to be interpreted in detail，promote the criminal legislation of sexual assault on minors，which needs to be intensive and subjective，give full play to the judicial initiative，make up for the legislative defects and show fairness and justice.