Students' understanding about Morphosyntax is often low due to its complex processes. This study attempted to design a learning handout that would help students solve their writing problems particularly in Morphosyntax cases. This qualitative study was conducted at two Indonesian Universities, namely UNTAG Banyuwangi and IAIN Jember Indonesia. Six phases in Design Based Research (DBR) by Hoadley (2004) and four phases of DBR by Reeves (2012) were combined as the design of the research. Four classes with a total of 114 students participated and the lecturers of writing course and grammar course were involved. Following the mixed design of DBR by Hoadley and Reeves, this study produced a learning handout that, after tested at the second cycle, proved helpful to solve students' Morphosyntax problems especially in Writing Class. The students facing writing problems decreased averagely 35-40% after they learnt writing using the produced learning handout. In this case, the needs to master more on Morphosyntax to support their English proficiency skills especially in writing has been solved.