Considering that the current of domestic appliances in steady work condition has the characteristics of linear superposition, the disaggregation algorithm for non-invasive domestic appliance loads is proposed. And this new algorithm features in taking the fundamental current and harmonic current of the steady domestic appliance loads as load characteristics. By marking any work condition of the domestic appliance load with “0” and “1”, which means only two states are available, close and open, the issue of domestic appliance loads aggregation can be turned into optimization and the work condition of each domestic appliance load will be identified via the improved chicken swarm optimization algorithm. Case study verifies this algorithm is of higher load accuracy and broader availability conductive to the popularization and application for the non-invasive domestic appliance loads identification technology.