With the rapid development of the LNG market all over the word,multi-source gas supply has become an important measure to improve the reliability of the city natural gas supply system.However,when the same pipeline network is shared by multi-source gases,it will lead to great changes of gas components at the end of the appliance of users.For a long time,our methods of the natural gas interchangeability have been from abroad,among which the AGA and Weaver Indexes are representative.Based on the data survey of gas components of Beijing, Shanghai,and Guangzhou, the Software of Gas Interchangeability Application System was compiled by Visual Basic programming language.Predictions were verified by the experiment data from the literatures and the laboratory to finish the research on its applicability.The results showed that the heat load and the CO emission couldn’t be well forecasted by using the AGA Index,neither the state of yellow flame.It is not for sure that these changes are related to the function of gas appliance,which still needs further research.%多气源供气已经成为改善城市燃气供气可靠性的一种手段，然而多气源接入同一管网会导致末端设备气源成分出现较大波动。长期以来，我国燃气互换性判别均借鉴国外，其中最典型的互换性判别方法为 AGA 和 Weaver 指数法。在利用 VB 语言编写燃气互换性应用软件的基础上，对广州、上海地区燃气组分数据和互换性实验数据的调查，以及自行设计实验获取北京地区的互换性实验数据，通过上述实验数据对 AGA 和 Weaver 指数法的预测结果加以验证，进行其适用性研究。
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