The QB/T 2805-2006 "Determination of the surface absorption rate of paper and Cardboard" standard specifies the test method used to evaluate the surface absorption rate of paper and Cardboard. The standard covers the evaluation of the surface preparation effect and mass characteristics of paper by measuring the rate at which the liquid is absorbed by the paper surface under standard conditions. These tests can help manufacturers and users understand the absorption performance of paper, especially before printing and coating, to ensure that the paper surface preparation meets the expected requirements. The implementation of the QB/T 2805-2006 standard helps to improve the production efficiency and mass Stability of paper products, and also provides a reliable basis for quality control during paper manufacturing and use.