Since its coming into the information explosion era,web has became a most significant way to receive information. The internet brings us a total new world,in the meanwhile,changes human’s work and life,and has huge impact on their action mode and values. However, this complicated network environment, which results in network negative news such increase, shows immediacy, openness and virtuality. As the pil ars of society , undergraduates is more easy to be influenced by the negative news when they are in " the mental state breaks the milk period".This paper analysis the negative effects and probable reasons, and set out the key point ,in order to propose solutions about how to make the negative news play positive effect to create a better web environment for the growth of col ege students.