There are risks of frequency and voltage security and stability due to the on-going replacement of conventional synchronous power plants by intermittent generation and DC transmission. Prompt and effective emergency regulation after faults can prevent blackouts. An online pre-decision method for emergency regulation of frequency and voltage security and stability considering running condition of equipment is proposed. Considering the influence of system protection, unit primary frequency regulation, automatic generation control and automatic voltage control on node injection after failure, the quasi-steady state mode after failure is automatically identified, and the frequency and voltage pre-decision-making model with the goal of minimizing comprehensive control cost is constructed. A check plan is formed through the enumeration and combination of measures, and the check plan screening is realized based on the rapid estimation of the measure adjustment amount. The iterative search of the pre-decision strategy taking into account the frequency and voltage safety issues is realized, and the specific equipment and control quantities are given. After the actual fault occurs, emergency control is carried out by matching the fault and the post-fault problem to reduce the risk of grid accidents. The effectiveness of the method is verified by an actual grid calculation example.