Abstract: Based on information of bridge type design scheme，objectively evaluates the bridge type scheme including qualitative index． Taking the design schemes of Mayang New Bridge as an research object， propose the method for qualitative index to solve relative membership grade．Multi-objective maximum distance method is introduced into the calculation of the index weight．Based on two-extreme fuzzy recognition theory，optimization of bridge type schemes model is established． The short tower cable-stayed bridge is the optimized outcome which is consistent with the objective reality．

Key words: bridge type scheme, fuzzy recognition, weight vector, relative membership grade, multi-objective maximum distance method