Adaptive training is an effective method to improve the precision of the load forecasting. Now there are many researches on the adaptive training in a single forecasting method or in an integrated model. However， the two parts are separated. Combining the adaptive training in single methods and that of the integrated model， this paper releases the concept of joint adaptive training（JAT） based on short-term load forecasting. It also builds the model of the problem and gives out analysis， summery and strategies. Besides， through a real sample， this JAT method is proved effective. In this way， this paper will provide a relative well-reasoned theory and concrete strategies to those applications of adaptive training of both the integrated model and single methods at the same time.