1.large arch K Span construction;
2. 8 grade aseismic
3. resistant snow at 80cm at least.
4. roof wind pressure can ignored.

compare with traditional steel construction structure, steel arch roof have below strong points:
1. low cost, fast construction, quick effect, about 10-50% cost can be saved compared with ordinary roof under the same requirements.
2.can prevent corrosion, leakage & water.
3.light deadweight and the foundations only cost a little.
4.fine integral performance, reasonable structure, superior performance in resisting wind(120km/h), rain, snow(80cm thickness) and earthquake( 8 grade), high safety factor.
5.more than 40years service life, low maintenance cost and can be maintained fast and conveniently.
6.beautiful appearance and large plasticity.
7.no columns and beams design, make good use of space and create fine spacing.
8. strong adaptability and used widely.