Abstract: The overall processes of 5 unexpected dangers in foundation pits are introduced from their initiation to treatment. The discussions on the results of dealing with the dangers show that the current management system of emergency rescue is hard to make timely and accurate judgment and proper decisions, so the more efficient system named core technology expert system can be tried. Its running mechanism is as follows: (1) The key to the emergency rescue is to judge danger accurately, and the core technology experts are invited to undertake this role. (2) After the dangers happen, the emergency leading group and designers for foundation pit should judge the criticality first, and then the core technology experts further judge and report to the relevant government departments. (3) The project owner dominates the rescue work and the government mainly monitors the legitimacy of the procedure, and government power can be used when people really need to be evacuated. The proposed emergency management system can ensure the benefits of construction units, government and related dwellers.