In recent years, the topic of "sustainable development" has been paid more attention all over the world. This has caused many freshwater resources to be seriously polluted and cannot be used due to the arbitrary discharge of agricultural, industrial, and daily discarded matters. As for big cities, because the ground is mainly made of cement or asphalt, then the urban heat island effect has become more prominent in recent years. At the same time, the problem of settlement on the ground caused by the ground being inaccessible for long periods of time due to isolation is very unfavorable to the surface water cycle. The new material permeable brick can effectively alleviate and modify the current phenomenon. It is made of discarded materials in the building and is tiled on a large area on the urban pavement. Give timely compensation. In addition, after the rainwater passes through the multi-layer filtration of the permeable brick and the surface layer, its pollution degree will be greatly reduced, and the remaining pollution components can be basically degraded by natural microorganisms.
1 Now permeable bricks and their application
1.1 Classification of permeable bricks 
Pervious bricks can be divided into two categories: ceramic pervious bricks and non-ceramic pervious bricks. In the meantime, ceramic pervious bricks are mainly industrial, construction, and daily waste materials, which are damaged, formed, and fired at high temperatures. Functional building decoration materials; the other type is mainly made of inorganic non-metals, and processed by environmentally friendly technologies such as adhesive bonding, mold reinforcement, and exposure. Because it does not require sintering, it is solidly called non-ceramic permeable brick.
In addition, permeable bricks can be classified according to their functions and applications. They can be divided into permeable bricks that are permeable to the brick itself and permeable bricks that are impermeable to the brick itself or can only penetrate or are slightly permeable.
1.2 The environmental protection of permeable bricks
Permeable bricks are mainly the secondary use of tailings waste, fly ash, construction waste, etc., which are solid green products. The amount of construction waste in our country is astonishing every year, about 1.55 billion to 2.4 billion tons, and the amount is still increasing year by year. However, in developed countries, the utilization rate of construction waste resources can reach 90% even. The utilization rate of construction waste resources is less than 5%.  By promoting the use of permeable bricks, the valuable resources of construction waste can be used effectively. Not only can it deal with many problems now brought to people, but it can also reduce the negative impact on the ecological environment caused by quarrying. Wait. The use of permeable bricks can also achieve the goals of energy saving, emission reduction and resource recycling. Therefore, the recycling and reuse of construction waste and the production of permeable bricks for construction waste are extremely hot and necessary. 
1.3 Current Status of Permeable Bricks at Home and Abroad
In response to the negative impact of urban impermeable grounds on groundwater resources, Germany has proposed a "rain and flood plan". The plan is to change most of the city's ground to permeable ground. For newly built communities, rainwater use projects should be planned for both industrial, commercial and residential areas. If there is no rainwater use method, the government will collect rainwater drainage equipment and rainwater discharge fees. 
Xi'an, a well-known city in China, is also one of the cities where permeable bricks are widely used in China. The policy of Xi'an and many cities at that time was to make themselves a "sponge city", and to change the city into a "sponge city", the permeable bricks played a "lung" role in this process.
2 How does the permeable brick alleviate the damage to water resources and the ecological environment at that time?
2.1 Urban runoff water pollution
In recent years, the pollution of urban highways has become increasingly serious, especially oil pollution from motor vehicles, heavy metal pollution, and organic pollutants.  These pollutants were washed into the sewers by the rain, and then flowed into rivers and lakes. The required sewage treatment value is very large, and the treatment cost is extremely valuable.
2.2 Reduce pressure on urban drainage systems
At present, there are various problems with sewage pipes laid in urban construction, and drainage in some areas is not smooth, and the phenomenon of stagnant water appears, which brings great inconvenience to people's lives. Due to the damage to the material of the sewer pipe and the decline of its function, it is no longer possible to deal with various problems such as urban drainage and flood prevention. Whenever there is a heavy rain, the outbreak of rain and runoff far exceeds the capacity of the urban sewer network planning. . Therefore, "seeing the sea" in various major cities is by no means a nightmare, and the main reason is various tragedies caused by the severe urban drainage system that cannot meet the discharge of rainwater.
2.3 The adjustment of permeable bricks to the ecosystem
Permeable brick is a new type of green building material product created to protect the urban ecological balance. Its primary purpose is to deal with many of the problems that occur in urban surface hardening, and to build a high-quality natural day environment. The characteristics of permeable bricks are: first of all, it has excellent water permeable and breathable functions. Rainwater actively enters the ground through the permeable bricks, which can timely compensate for soil water and groundwater. Second, the permeable bricks control the temperature and humidity of some of the surface space. Alleviating the urban heat island effect has a greater effect; Third, rainwater can enter the ground through permeable bricks, which can greatly reduce the pressure of urban drainage and flood control. Together, it can serve as a filtering device to further reduce water pollution. Fourth, after using permeable bricks, After the rain on the city, there will be no water accumulation, so you should travel and then traverse the quality of our lives; of course, the mentioned is only a small part of the benefits brought by the permeable bricks, which will be used in the future city construction and improve the residents' day It has a far-reaching influence and cannot be replaced.
3 conclusions and aspirations
Permeable brick, as a new type of green environmental protection material, can greatly alleviate the problem of urban surface hardening, can make the city's ecological environment maintain a balance, and build a high-quality natural and daily environment. In addition, it also has the characteristics of moisturizing, high strength, can absorb and reduce noise, useful anti-slip and cold resistance. Its primary raw materials can be slag waste or discarded ceramics. : Can make rainwater penetrate the ground quickly, compensate the water and groundwater in the soil, can improve the living conditions of plants in cities, and microorganisms in rich soils; can dispatch urban microclimates, greatly alleviate the urban heat island effect and alleviate urban flood control, Drainage pressure reduces water accumulation in the journey and reduces water pollution in public waters. The convenience of urban residents when going out, the surface of the permeable bricks can prevent road reflections and absorb the noise of walking vehicles. Trekking comfort, and its colors and standards are diverse, simple and natural. Very economical.