One. Introduction Materials 1 mechanism: (1) Xypex active substance is an inorganic catalyst, water as a carrier, into the concrete under the effect of the capillary osmotic pressure, catalytic unreacted cement particles and water, or the end of a complete response, generating a dendrite crystals shaped crystals, clogged pores, compactness and enhanced adhesion of concrete. (2) This role in the formation of the reaction conditions circulation loop, constantly clogged due to the late cement shrinkage microcracks, dynamic load generated by the bridge so as to achieve a permanent effect. 2 efficacy (1) the active substance catalyst to help overcome the cycle of concrete cracks hazards. In order to protect the box girder (especially those with negative moment, Izod, etc.) steel from corrosion. (2) where a unique index: multiple impermeability indicators. Ie brushing or incorporation Xypex specimens after 28 days curing impermeability permeable, water conservation and then 28 days, then a permeability, impermeability intensity is higher than before. Then pressure permeable, and then curing, do impermeability indicators and meet the design requirements. (3) For the following micro-cracks can heal 0.4mm, 0.2mm and above specification required for processing. (4) is a medicine of concrete alkali aggregate reaction control diseases, anti-carbonation. 3. Two experiments (1) two-sided test for each capillary crystalline 5cm do first test of a high 15cm blocks A, after form removal painted Xypex Concentrate, conservation 7 days. Do a 15cm high test block B, the cover on the specimen A, curing 21 days. The A, B hybrid drill core samples along the cylinder centerline C surface (ie, Xypex coating layer) on the cut open. Then along the C plane up and down at each 5cm cut specimen, measuring the distance under the surface of the coating C at the surface of each 5cm impermeability, compression, still meet the design requirements. Conclusion: Xypex crystalline materials can be double-sided penetration, but also very deep penetration. (2) in HK MTR Tsuen Wan Station do six cycles breakdown, maintenance, impermeability test HK KCR Line, Tsuen Wan West Station about 80000m3 all waterproof concrete, 90000m2 area using Xypex material, but not with a little roll, and Xypex Waterproof to 30 years to give the system of quality assurance. HK MTR made six cycles in Australia flooding, maintenance, measuring permeability tests to verify the Xypex for microfracture amazing self-healing capabilities. 4.Xypex world status (1), in such materials for the world, accounting for more than 80% market share. (2), from the invention during World War II, has a 50-year history. (3), made some of the world's major projects such as: HK MTR, the Singapore International Theater, Las Vegas, Beijing National Grand Theater, as well as the construction is HK Disneyland has decided to make use of Xypex waterproofing system. 5. Xypex in the country of reference GB18445-2001 1., continuous cast layer utility: box girder bridge deck waterproofing protection ways to choose this method, you can brush the whole deck. This method is more convenient than the latter some construction. As for the cost comparison of the two methods, the layer thickness and thus determines how much cement capacity. Kason Building Materials Co., Ltd. in Guangzhou Xypex capillary crystalline waterproofing anti-corrosion materials, is currently the only one on the market, "a good, never leakage" of material, please consider occurs when you have to patch the cracks in the concrete under this material, the details can be found on our website: http: //www.gzxypex.com.cn