The structures of glissile super-dislocations on basal planes in D019-type alloys were analyzed. It was shown that the a super-dislocations could dissociate, with the formation of complex stacking faults (type-II configurations) in the basal plane. It was also shown that the dissociation of a super-dislocation, with the formation of an antiphase boundary (type-I configurations) had a lower energy. The molecular dynamics method was used to study the core structures of a-type super-dislocations in the basal plane, for configurations of types I and II. The core of the partial Shockley dislocation entering an extended 1/6<2¯1•0> dislocation (configuration I) in the basal plane was shown to have a non-coplanar structure. Spontaneous blocking of 1/3<0¯1•0> super-partial dislocations of 30° orientation, which entered screw and 60° a-type super-dislocations Dissociation of 1/3<1120> Super-Dislocations upon Basal Slip in Ti3Al. L.E.Karkina, L.I.Yakovenkova, M.Y.Rabovskaya: Physics of Metals and Metallography, 2002, 93[1], 27-35