P T. Kurabo Manunggal Textile is a yarn spinning factory by processingcotton fibers into yarn. The cotton fibers are stored in the raw material warehouse.The warehouse stores 12 types of raw materials which are divided into 3 sub -groups weighing ± 200 with 6 storage areas. The material handling used is aforklift. This study aims to design a simulation of the layout of the raw materialwarehouse and a simulation model of the layout of the raw material warehouse toreduce the time of moving raw materials. The layout design of the raw materialwarehouse is carried out using ProModel and class-based storage methods.Evaluation of the initial conditions and the results of the repairs are simulated usingProModel software. Based on research, the storage process in the raw materialwarehouse is still not optimal because the raw material storage area has anaverage utility of 37%. Currently, the transfer time of 12 types of raw materials inthe warehouse is 86.47 hours per month. The results of improvements with theclass-based storage method are removing one of the storage areas and relocatingraw material storage materials. Therefore, 3 improvement scenarios are proposed,scenario 1 is changing the layout of the raw material warehouse and relocating thestorage area, scenario 2 is adding material handling, and scenario 3 is combiningscenario 1 and scenario 2. The evaluation results with simulation show that forscenario 1 there is a decrease in time. displacement 17.44% becomes 71.387 hours,scenario 2 decreases the displacement time from 15.94% to 72.687 hours, andscenario 3 decreases the transfer time from 28.85% to 61.524 hours. The simulationresults show that scenario 3 has the largest percentage decline, so scenario 3 is theselected scenario