Based on the study of flexible assembly tooling configuration on aero-engine

he workspace of aero-engine flexible assembly tooling is calculated

and a mathematic model is set up by Monte Carlo method

the design parameter dimensional optimization for workspace is carried out

then the global condition number for construction of different sizes is solved

the result is used for the optimization of machine kinematic.At last the conservative congruence transformation（CCT）stiffness matrix is derived

and stiffness mapping in the direction of X

Y

Zis simulated.These results are applied for the analysis and discuss of stiffness.This work has outstanding theoretical significance for assembly accuracy improvement

optimizing assembly performance

pose and position reasonable selection during the assembly and dimensional optimization.