Filter cloth is the important part for filter press. The performance of filter press is mainly depended on the separation nature of the filter cloth. The filter cloths are classified as two types by material: one is nature fibers such as cotton, woollens, silk, and linen. The other is synthetic fibers such as dacron, nylon, polyacrylonitrile, vinylon, acrylic fibers, and polyester fibers. Also, the materials can be classified as three types by yarn: monofilament yarn, multifilament yarn, spun yarn. The monofiament is not easy to cause block adn good at cake discharging. The multifilament yarn has high strength and also good at easy discharging and renewable performance. The spun yarn is good at solid capture and have better sealin performance.