The Jiquan ±1100kV transmission line in the construction close multiple parallel Anhui-to-East UHV 1000kV AC transmission lines. Since the electromagnetic coupling between the lines makes the Jiquan transmission line in the construction facing serious problems of induction. A three-dimensional moment method model for transmission lines is established in this paper. And the induced voltage and induced current of the Jiquan transmission line under construction, which is parallelling with a double-circuit UHV AC line, are calculated and analyzed. The main factors affecting electrostatic induction voltage and electromagnetic induction current are also analyzed. In the end, a study is conducted on different grounding schemes during construction and the proposed grounding scheme are put forward.