The purposes of this study to determine whether the web-oriented constructivism instruction approach can improve student's habits of mind. The method used in the study is pre-experiment method with one-group pretest-posttest design who applied to students in 10st grade of senior high school and total 38 students. Research data is collected using critical thinking test, creative thinking test, self-regulation questionnaires, and contributes a web-oriented constructivism instruction approach to habits of mind observation sheet. Data were analyzed using hypothesis test and gain calculation. The result of this study that there are significant differences in student's habits of mind score between before and after being applied the web-oriented constructivism instruction approach, and if based on the results of gain calculation, it was found that the most student an increase in the medium on gain category. Other than that, if judging from the contributes a web-oriented constructivism instruction approach to habits of mind category it was found the results of a very good interpretation.