Writing is an activity of expressing ideas or ideas through the painting of graphic symbols that are not only understood by the author but can also be understood by others as a form of indirect communication. A procedure text is a text that contains explanations or instructions about the steps or stages that are systematically arranged and must be taken to achieve the goal. The fact shows that students' writing skills are deficient, especially in learning to write procedure texts. Applying the incubation learning model is expected to improve the quality of learning to write complex procedure texts. The implementation of this research was carried out with two objectives. First, this study examines the significant difference in the ability to write procedural texts between students who received learning with the incubation learning model and those who received learning without the incubation learning model in class XI Mathematics and Natural Sciences 2 in a Senior High School in Lampung, Indonesia. Second, to test the effectiveness of the incubation learning model in learning to write procedural texts in class XI Mathematics and Natural Sciences 1 in a Senior High School in Lampung, Indonesia. This study used quasi-experimental research with a pretest-posttest control group design without randomization (Randomized Pretest-Posttest control group design). The sampling technique used is a purposive technique based on special considerations. The assessment results will be used as analysis data according to descriptive statistical procedures using the SPSS (Statistical Package for Social Science) computer program package for Windows Version 16. The results show that the incubation learning model effectively improves the ability to write procedural texts in class XI middle school students.