Complete Classification of Flag-Transitive Point一Primitive ! `* S* }" w% n4 I' w5 D$ X: D 2-Designs with Socle + T* K6 e/ [% E5 M4 I4 Q. x r * _0 m$ t3 i! h" X6 u- _7 o In recent years several authors have determined some 2-designs with flag-transitive point-primitive automorphism group G of almost simple type with sporadic socle. Here we obtain the complete classification of flag-transitive point-primitive non-trivial 2-designs with socle Mli,and find that there are precisely 14 such nonisomorphic 2-designs. 3 G( S5 i9 E4 \; d, Q $ x: |$ u7 D" ~* m+ X; pKeywords 2-design; flag-transitive; point-primitive; Mathieu group3 I+ M7 t; u/ b. i- J0 T' d