This research is aimed to reveal whether: (1) Computer BasedCommunication material is more effective than Textbook material to teachwriting to the XI grade of SMAN 5 in the academic year of 2015/2016; (2)the students who have high learning motivation have better writing skillthan those who have low learning motivation of the XI grade of the school;and (3) there is an interaction between teaching materials and learningmotivation to teach writing to the XI grade of the school.This experimental study was conducted at SMAN 5 Yogyakarta inthe academic year of 2015/2016. The population in this research is the XIgrade students of the school. The total number of population is 174 studentscoming from six classes. The samples are XI IPA1 as the experimental classand XI IPA 2 as the control class in which each consists of 30 students.Each class was divided into two groups (the students who have high and lowlearning motivation). In collecting the data, the researcher used test andquestionnaire. The data were analyzed by using Multifactor analysis ofvariance ANOVA 2x2 and Tukey test.Based on the result of analysis, there are some research findings thatcan be taken: (1) Computer Based Communication material is moreeffective than Textbook material to teach writing; (2) the students who havehigh learning motivation have better writing skill than those who have lowlearning motivation; and (3) there is an interaction between teachingmaterials and learning motivation in teaching writing.Finally, it can be inferred that Computer Based Communicationmaterial is an effective material to teach writing for the XI grade students.This material depends on the levels of learning motivation. Hopefully, thisresearch gives contribution for the students and teacher in teaching writing.Keywords: Computer Based Communication Material, Textbook Material,Learning motivation, Experimental study