Utilizing the entanglement property of Greenberger-Horne-Zeilinger (GHZ) state, a theoretical scheme to realize multicontrol remote single qubit unitary transformation is presented. In the present scheme, one party (Alice) can perform a unitary transformation on remote quantum system (Bob), in which the full structure of the unitary transformation is in a sense split and controlled locally by the two parties. By adjusting the measurement basis, the third (Cindy) can modulate the entanglement between Alice and Bob to control the probability of successful implementation. The communication between Cindy and Alice (Bob) is also controlled by Cindy in quantum way.