The use of online library has attracted ex- tensive attention of the society, which can be found in TV programs, newspapers, university classes and many aspects of our life. It is gen- erally agreed that it has been playing increas- ingly important role in our life, which has brought us a lot of benefits. A number of factors are accountable for their popularity. First of all, online library brings people,especially students, much con- venience during their study as they can have access to diverse reading materials while just sitting in the dorm, which can be so efficient that students don' t need to bother them- selves with commuting from the dorm to the school library. On top of that, students in some remote areas are also able to take ad- vantage of those online libraries to broaden their horizons, which can compensate for the lack of adequate educational resources. From what has been discussed above, I think online libraries are extremely crucial. With its seemingly magic power, it can not only encourage people to read extensively but serve as an efficient instrument for stu- dents to improve their learnina efficiencv.