Due to the change of usage, the load of the workshop increased greatly, structure and structure members are should be strengthened.Calculations results show that the bearing capacity of the frame beams and slabs are not large enough.So the project, based on comprehensive factors, attempts to reinforce the building with comprehensive strengthening method.Beams are strengthened with carbon fiber reinforced polymer to enhance the capacity.When the steel and slab are not sufficent,200mm width CFRP are tied with the top and the bottom of the slab.