In the non-intrusive load disaggregating, the result of one type of algorithms is often affected by the serious issues like voltage fluctuation and the limitations of recognition algorithms, which make it difficult to obtain high precision of load disaggregation. A decision fusion method is presented for non-intrusive load disaggregation, which is based on the results by using several types of algorithms. Firstly, in this method, the robust feature is extracted according to the information of current and power in the bus line. Then, three common recognition algorithms are used to recognize the state of device whether it works or not. The decision is then made according the results of those algorithms, thus obtaining the promising results. In the final part of the paper, a real case study is adopted to verify the decision fusion method. The results show that the proposed method provides better performance for identifying the open or close state of home loads than that of one type of the algorithm.