A new control strategy applied to Heat Pump Air-Conditioning system with hybrid of cooling tower and ground source cooling water system, Time Interval with Temperature Difference Control (TITDC), is proposed in the article. And then a simulation model is developing for a case study building, by using a building energy simulation tool, TRNSYS, to verify the advantages of the new TITDC strategy contrasted to Temperature Difference Control (TDC) stategy on the critical parameters of annual ground heat energy balance, load satisfied percentage for long term and energy consumption.%提出了一种用于冷却塔复合地源热泵空调系统的新型控制策略-分时段温差控制。然后通过对一个具体冷却塔复合地源热泵空调系统的TRNSYS模拟，从土壤的取放热量平衡、系统能否长期满足空调要求和系统的能耗三个方面综合分析了系统的运行控制采用分时段温差控制较采用温差控制的优点。
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