Traditional data envelopment analysis (DEA) is based on the data of the previous value to evaluate efficiency, which reflects management's own lag. In this article,we first briefly introduce the development process of interval DEA, Then according to the actual situation, to expand the scope of interval value of indexes and do extension research in interval DEA. After this, based on the predict interval value, we use interval DEA model to forecast the efficiency of seventeen telecommunications companies in municipal cities of Anhui province. According to the forecast efficiency, though rectify time after time, we then formulate next year's budget schedule. Finally compare with the data of previous year, so as to provide more useful information for decision-makers in the next year.