Tea seed cake is in auburn color and powder in shape. It is the dross of Theaceae fruits after oil manufacture. It contains approximately 10% of saponin, which is a sort of hemolysis toxin that can make hemolysis of bacterial cells so that disinfections and bactericidal action can be achieved. Such actions can help kill and remove adhered infusorians and ulothrix and can be used in pools and ponds and to clear away angleworms in golf courts and football grounds. Tea seed cake is most commonly and widely used in the clearing of crevette and crab ponds for its efficacy advantages over others medicaments: it's a sort of green fertilizer and leaves no toxic remains and is safe to humans; it doesn't kill aquatics but help stimulate the growth instead; it causes no side effect to the juveniles of shrimps and crabs but help in their exuviations instead; it help increase the fertilizer efficiency in the ponds and can distinctly raise the out pool rate of young shrimps and crabs. The protein content of tea seed cake is quite high. It is a natural, pollution-free, high quality and environmental friendly organic fertilizer and therefore is the best choice for pollution-free vegetables, flowers and fruits. Tea saponin and high protein feedstuff etc can be extracted from tea seed cakes. Tea saponin is widely used in the industries of daily chemical products, pesticides, building materials, foodstuff, hospitals and shampoos. Besides, it is the also the main material for high-grade cosmetics