Abstract: Combining the power and heat supply in Inner Mongolia Huaning Thermal Power Co., Ltd., choose low pressure cylinder with high back pressure and low pressure cylinder axis as alternative objects, introduce the issues of the low back pressure, the high backwater temperaturethe heat supply network, the over-high dischange temperature under high back pressure working condition, the calculation of the runaway speed during the scheme implementation, as well as the relevant meassures.And the analysis and comparasion of the load adaptability and flexibility, the network economy of the two schemes resulted in that low pressure cylinder axis heating scheme could satisfy the high heating water temperature in cold areas on the basis of generating capacity, which was more suitable for reconstruction demand in Inner Mongolia Huaning Thermal Power Co., Ltd.