Background
The Huanxiu Lake Science Popularization and Education Center was built in Xiaying Town, Jizhou District, Tianjin. Over the years, Xiaying Town has experienced a continuous loss of population and outdated public facilities. Although it is located at the junction of Beijing and Tianjin, its development is still lagging behind. In recent years, in order to coordinate the new development planning of Beijing, Tianjin and Hebei, Jizhou District will create a global tourism, which brings new development opportunities to the ancient villages located at the junction of Tianjin and Beijing.
In 2020, the government invested in the construction of the Huanxiu Lake National Wetland Park in collaboration with regional tourism planning, focusing on the protection of wetland ecosystems, rational use of wetland resources, wetland education and scientific research, thus collaborating with regional tourism planning for the purpose, and the studio was invited to design an exhibition building to science education in the newly planned Huanxiu Lake Wetland Park.

Design Concept
The west of the building is close to the landscape of the wetland plank road, and the eastern part is the wetland science area within the site. The design follows the island layout of the landscape and is fully integrated with the red line of the reserved oval building site, and the form is more approachable.
In order to achieve harmony between the building and the environment, the design precisely controls the height of the building so that it is not higher than the highest height of residential buildings in Xiaying town, presenting a modest posture in the traditional village and natural environment. The overall height of the design is controlled at about seven meters, and provides a two-story terrace with a view of the distant mountains, with the roof side sloping towards the dam, overlooking the wetland landscape of the park, the gurgling stream in the middle, and the mountains in the distance. The beautiful view of the river to the west and the dam in the distance is successfully incorporated into the building.
In addition to height control, the facade form of building also utilizes a continuous glass curtain wall to create a natural transition from the indoor exhibition to the outdoor garden, makes the view more light and transparent for the indoor exhibits. It allows children visiting the exhibition to connect with nature in a unique way.

Spatial Experience
Looking at the building from the outside, the use of glass curtain wall makes the missionary hall more light and transparent, the entity of the building uses reconstituted bamboo veneer facade to balance durability and nativity, and when night falls, the building is as warm and rustic as a forest cabin under the cover of trees.
The roof is surrounded by 24 steel rafters of different lengths, each supported on the inner and outer ring beams, each placed at a different angle, which gather to shape a curved roof.
The shingle roof slowly extends downward, which makes the building become long and slender and also encloses the space under the corridor, which can also be used as an extension of the exhibition space, walking along the outer corridor, you can see the inside and outside of the building.
Entering the room, the tour route unfolds along the circle. The high windows inside and the glass curtain wall outside bring rich light and shadow changes to the missionary hall, connecting it with the internal topography shaping to form a whole nature picture. The interior is rich in interesting flora and fauna exhibits, providing a child-friendly space for children around to learn about nature.
Visitors can reach the second floor platform by climbing slowly along the indoor circular ramp.The sunlight shines into the interior along the inner glass curtain wall, bringing a rich change of light and shadow to the ramp.
Reaching the second floor platform, the circular skylight comes into view, and the height of the roof falls slowly from east to west, with the lowest point of the roof being 1.5 meters, so visitors can look out along the roof.

Design Difficulties
First, the project based on the implementation of the landscape project, so the project was initially confined to a small, approximately triangular plot, and the surrounding landscape design was in its final stage. We abandoned the attempt to break through the site in terms of shape and fully integrated the architectural plan with the given site, creating two levels of space inside and outside a triangular plan with rounded corners, and creating a second level open terrace looking up the hill based on the multi-purpose hall at the core of the plan. Releasing the influence of the space from the inside out was the biggest challenge we reached with this design.
Second, to ensure the equal height of the wall and the outer circle column grid, its supporting structure is not completely parallel to the inner and outer circles of the overall architectural form, and the inclination angle and length of the rafters are different. Therefore, we separate the structure from the exterior wall to obtain a freer facade form.
Third, while meeting the slope requirements, the circular ramp needs to be matched with the roof slope angle. After multiple debugging, the best roof angle and ramp starting point have been obtained, which have been fully solved in the construction drawing design process.

Social benefits
With the publicity and education center as the center, in coordination with the regional tourism planning, and it aims to solve the problem of labor force loss and aging in rural areas and further enhance the competitiveness of rural economies. The science popularization and education Center meets the needs of the urban population in Beijing and Tianjin to participate in the science and exploration of ecological civilization, and also meets the employment needs of local residents at the same time. Relying on the policy of the whole area tourism industry layout, children on holidays, accompanied by their parents, experience the wetland scenery, learn popular science knowledge, and make local handicrafts. While teaching and entertaining, they improve the quality and vitality of the rural residential environment and enhance the demonstration effect of rural revitalization.