This research was aimed to develop a feasible and effective web-based learning in improving a creative writing ability for PGSD students. This was a research and development (R&D) study developed by Borg & Gall. Data was gathered from assessment of material experts, student questionnaire and a creative writing ability test. The developmnet of a web-based learning was conducted by developing learning equipment that cover syllabus, class event unit (SAP), web-based learning media and a creative writing assessment. The research results showed that learning equipments developed were feasible and effective to be used in a learning process. That feasibility was seen from material expert assessment and students' response with a samegood assessment. Meanwhile, the effectiveness of a web-based learning in improving a creative writing ability was based on the improvement and average difference of student creative writing ability that is significant after treatment.