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For the purpose of controlling the power system and in particular predicting voltage collapse, the use of stability indices has become a mandatory operation. Nevertheless, it would be essential to consider reliable ones when managing the power system. Otherwise, considerable damage can occur leading to blackout phenomenon. In the light of this paper, an improved reactive line index will be designed to identify sensitive areas in transmission networks. Based on Pi-model of the line, the proposed index takes into account the shunt admittance of the lines as well as the angle gap between sending and receiving buses. The principal aim of this index is the online control of the reactive power flow and voltage stability prediction. Within this framework, the novel index is compared to those found in the literature, and has proven to be more appropriate than simplified indices and to be more sensitive than other index that considered the same model of line. To indicate this effectiveness, two power systems have been deployed, namely IEEE 6 bus and new England IEEE 39 bus test system. All simulations were performed using PSAT software. [ABSTRACT FROM AUTHOR]