Natural plant fibers, included within the scope of sustainable materials, are preferred in many industrial applications due to their low cost, abundance, lightweight structure, and environmentally friendly nature. Recycling waste generated in parallel with increased production has become a significant issue in recent years. Natural plant fibers can provide many of the properties expected from filler materials used in the production of composites. Furthermore, the fact that the matrix material is a biodegradable polymer makes the resulting composite a completely recyclable material. In this study, a composite produced by mixing ramie fiber, a natural plant fiber, with polylactic acid (PLA) becomes a biodegradable, environmentally friendly industrial product. However, the use of natural fibers in composite production has both advantages and disadvantages. One of these is their inherent water absorption (hydrophilic) property. Due to this, the natural fibers in the composite cannot form a good interfacial bond, absorbing moisture from the matrix and causing swelling over time due to the absorbed moisture, further weakening the interface. Therefore, surface modification processes are applied to natural plant fibers before composite production. Substances such as hemicellulose and lignin, which cause a hydrophilic structure, are removed from the fiber structure, increasing the cellulose content and improving surface roughness. Chemical treatments applied to the surface can be applied individually or in combination with multiple treatments. In this study, the fibers were first treated with an alkaline treatment (with sodium hydroxide) and then with a silane treatment (with SiH₄). After the chemical treatments applied to ramie fibers, the water absorption percentages decreased over a period of seven days, while impact resistance improved. However, a slight increase in absorption values ​​was observed with increasing immersion time. Impact resistance decreased with increasing time.