This course is designed to introduce students to computational methods in Astroparicle Physics. The course begins with review of Cosmic Rays. After brief introductions to basic of computer programming, the course will cover Mote Carlo simulation and data analysis technique for cosmic rays. Through this course, students will understand air shower production, and detection mechanism. Students also will gain various practical skills in Linux operation system, C/C++ programing, and data analysis base on ROOT. The course consists of lectures and self-practice, which requires students to bring his/her own laptop computer.