A method for selecting power exchange connection modes for sub-areas in a power grid comprises steps as follows: A, power grid parameters of a fault sub-area and an adjacent sub-area are acquired; B, power vacancy of the fault sub-area is determined; C, exchange power of all connecting lines in the fault sub-area is determined; D, whether a main transformer down channel of the fault sub-area is broken down is judged, if yes, one connecting line with the highest exchange power is closed to be taken as an exchange connecting channel, and otherwise, a buscouple switch is switched off to be taken as the exchange connecting channel; E, whether the power vacancy of the fault sub-area is met is judged, if yes, a step F is executed, and otherwise, a step G is executed; F, whether the exchange connecting channel is overloaded is judged, if yes, the step G is executed, and otherwise, the connecting way is selected; G, one connecting line is added as the exchange connecting channel, and the step E is executed. According to the method for selecting the power exchange connection modes for the sub-areas in the power grid, the effective power grid sub-area exchange ways can be provided, and the system stability is improved.