Reading is one of the four skills in English which is very important to be mastered by students. This research is a descriptive quantitative research, with the purpose to investigating how students reading comprehension in the application of online learning in the class of XI science at SMA Negeri 3 Kotabumi North Lampung Academic Year 2020/2021. The population in this research were all students of class XI science SMA Negeri 3 Kotabumi academic year 2020/2021 which consist of six classes and total member of students were 203 students and researcher took class XI science 1 as sample which were 33 students. The research used purposive sampling technique. Some considerations namely by considering the saving in costs, time, and energy and the selection of a representative sample of the population. The instrument used to collect data in the form of a multiple choice test consisting 40 items to collect the try out data and 25 said valid to collect the research data. The data analysis shows that rcount (0.702) > from rtable (0.540). In conclusion, students reading comprehension in the implementation of online learning in class XI at SMA Negeri 3 Kotabumi North Lampung Academic Year 2020/2021 was effective.