The　performance　of　landing　gear　retraction　mechanism　in　aircraft　directly　affects　its　safe　operation.　Therefore,　it　is　important　to　analyze　and　evaluate　its　comprehensive　performance　during　the　design　process.　Multiple　single　kinematic　and　dynamic　performance　indexes　of　landing　gear　retraction　mechanism　could　be　solved　by　CAD/CAE　software.　The　weighting　factors　of　every　single　performance　index　are　used　to　distinguish　the　different　effects　of　comprehensive　evaluation,　and　also　achieved　by　the　expert　investigation　method.　Combining　the　a　priori　information　of　the　mechanism,　the　comprehensive　performance　of　landing　gear　retraction　mechanism　could　be　analyzed　by　Relative　Principal　Component　Analysis　(RPCA)　method,　and　the　scale　of　the　landing　gear　retraction　mechanism　with　the　best　comprehensive　performance　could　be　effectively　selected.　Further,　RPCA　could　also　provide　a　scientific　reference　basis　for　the　optimization　design　of　landing　gear　retraction　mechanism.