Since 2010, when China started launching its low-carbon pilot projects, three batches totaling 81 cities and 6 provinces have become low-carbon pilots. The Alliance of Peaking Pioneer Cities (APPC) was established at the US-China Climate-Smart/Low-Carbon Cities Summit in 2015, and was welcomed by a lot of cities and provinces, whom all released their own timetable for peaking CO2 emissions. In 2017, low-carbon pilots in China altogether represented 34% of the population, 56% of the GDP and 40% of carbon emissions. These pilots have given city administrators and others rich experience to further pursue low-carbon growth. It is iGDP’s mission to systematically combine these experiences — to compare the different results of policies and measures and to use different perspectives to understand the process of low-carbon transformation. We will supplement these with case studies to offer specific suggestions to cities aiming to go low-carbon.