通过对低分子量聚碳酸酯熔融流变性能的测试，讨论了此类聚碳酸酯在流变曲线上不同于通用标准级聚碳酸酯的特殊性。并提出微量吸湿改变其流动类型和产生润滑作用的观点。此外，还测定了相应流动活化能，并对其变化趋势进行了初步说明。 By testing the rheological properties of low molecular weight polycarbonates, we discuss the particularities of rheological curves of these polycarbonates that differ from the common standard polycarbonates. And put forward the idea that trace moisture can change its flow type and produce lubrication. In addition, the activation energy of the corresponding flow was also measured, and the trend of its variation was preliminarily described.