This article aims at describing word formation rules, word formation shift on acronym, cliping, and blending, and productivity of word formation found in written language of bahasa Indonesia. The data were taken from selected newspapers and magazines published locally and nationally in Indonesia. The findings indicate that there are some shifts on word fomation rules of bahasa Indonesia especially in acronym, clipping, and blending. The most productive word formation includes initial word acronym, end-part word clipping and initial parts blending.