In order to control unqualified space between landing gear joint in turboprop engine nacelle assembly

multi-level assembly information model of landing gear join location structure is established

and dimensional chain of the location structure is generated. Then the location structure tolerance information table is constructed. Landing gear location and assembly structure is analyzed by using 3DCS deviation analysis software to simulate unqualified rate and obtain key dimensions that have an important effect on space between landing gear joint during the structure assembly. Finally

the key dimensions are optimized

which reduce the unqualified rate effectively. Proposed design optimization solves problem of the space deviation in turboprop engine nacelle assembly.