The TAPPI T 200 standard specifies the method of pulp laboratory beating using Valley beaters. It aims to evaluate the paper mass of pulp through controlled mechanical treatment. The method is suitable for all types of pulp, including chemical pulp, mechanical pulp and their mixed pulps. Valley beating method simulates the beating process in industrial production by adjusting the beating time and beating strength, providing a scientific basis for paper process optimization and pulp quality control. The standard provides a unified specification for laboratory beating operations in the paper industry. It is widely used in pulp research and development, mass testing and production process adjustment.