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In this paper, we prove the existence of certain symplectic conifoldtransitions on all $CP^{1}$-bundles over symplectic 4--manifolds, whichgeneralizes Smith, Thomas and Yau's examples of symplectic conifold transitionson trivial $CP^{1}$-bundles over K\"ahler surfaces. Our main result is todetermine the diffeomorphism types of such symplectic conifold transitions of$CP^{1}$-bundles. In particular, this implies that in the case of trivial$CP^{1}$-bundles over projective surfaces, Smith, Thomas and Yau's examples ofsymplectic conifold transitions are diffeomorphic to K\"ahler 3--folds.

Topology of certain symplectic conifold transitions of $CP^{1}$-bundles