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This present study investigated the effects of writing workshop based on practical investigation on students writing skill of popular scientific article. Students were asked to write popular reports of science about marine resources. A quasi experimental design was used with two 10th-grade classes at the department of Fisheries Product Processing Agribusiness at Marine Vocational High School, Indramayu, each consists of 20 students. The experimental group of students assigned into the writing workshop based on practical investigation, while the control group assigned into the writing workshop based on conventional practicum. The learning stages of experimental group are divided into four stages, namely the introduction stage, the investigative practicum stage, the workshop stage by experts, and the presentation stage. The scientific stages in an investigative practicum can provide actual knowledge that can be the initial capital for students writing popular scientific articles. Factual knowledge and daily experience will motivate students to start writing. Before the treatment, a pre-test was administered to both groups in order to investigate the writing performance and sub skills of focus, sources, style, and vocabulary of students. Popular scientific article assessment results indicated that the experimental group performed significantly better quality and quantity of writing popular scientific article than the control group.