Four structural types of low-height beam bridge corresponding to bi-prestressed concrete structure, double-side prestressed concrete structure, twice prestressed concrete structure and conventional prestressed concrete structure were employed to compare their mechanical performance, deformation performance, and economy. It has been found that the optimization of structural types and prestress configuration can effectively ameliorate the structural performance of prestressed concrete low-height beams. Twice prestressed concrete structures can reduce the architectural height, decrease the creep camber by up to 50% and save the prestressing steels by more than 10%, compared with the conventional prestressed concrete structures, and have more techno-economic advantages than other three prestressed concrete structures.