HEA is a major patented achievement jointly developed by the China Academy of Building Materials Science and Zhejiang Sanshi Group Special Cement Co., Ltd. The physical properties of HEA technology are superior to similar products. It can resist sulfate erosion of concrete, has small shrinkage in the later period, high concrete strength, low dosage, and extremely low alkali content. It is the new generation concrete anti-cracking and anti-seepage expansion agent with the best performance at present, and is in a leading position in the domestic industry. Anti-seepage must resist cracking and cracking to prevent seepage. If it does not crack, there will be no seepage. The overall waterproofing and anti-seepage effect does not depend on the impermeability level of the concrete itself, but more importantly, whether it has anti-crack performance. Therefore, resistance to cracking is more important than resistance to seepage. To solve the waterproofing problem of concrete, it is necessary to solve the shrinkage of concrete and inhibit cracking. Only anti-crack expansion waterproofing agent can achieve the purpose.