For work feature of tackle-block mechanism compensating amplitude of variation on machinery lifting

using traditional mono-objective optimization and numerical solution on design of the mechanism

the optimum result can not satisfy the requirement of economy and stability in the meantime and is not accurate enough. Based on that

multi-objective optimum design and genetic algorithm are applied

objective function comprehensive embodying stability and economy of the mechanism is established and evaluative function is raised by fuzzy theory. The technical indicators of multi-objective optimum result on the example are improved in comparison with those of Sun’s book.