This article is aimed to describe: (1) the increase of ability to write in Arabic using the method of Musabaqah Bithaqah Mukhtalithul Kalimah (MBMK), (2) behavior changes on the students after learning to write Arabic using MBMK method. The method is done one the XD students of MAN 1 Yogyakarta. The proceedings of this research are done in two cycles. Every cycle has four stages, namely: planni…