1. Define related terms such as sliding door, door leaf, wooden sliding door, wooden frame, etc.; 2. Classify the types of indoor wooden sliding doors; 3. Classify wooden materials, alloy profiles, sealing and elastic materials, as well as hanging wheels and Put forward requirements for the raw materials of the guide rails; 4. Put forward important technical requirements such as the appearance of the sliding door, allowable dimensional deviations, moisture content, opening and closing force, noise, impact resistance, and limits of harmful substances.