An experimental study on the emissions of a diesel car fueled with national II diesel fuel, Shanghai IV diesel fuel and mixed fuels B10, G10 and C10 is conducted, in which its modal emission characteristics of HC, CO, NOx and CO2 with I-type test cycle in GB 18352.3-2005 are analyzed. The results show that compared to national II diesel fuel, the engine fueled with Shanghai II diesel fuel, B10, C10 and G10 has lower emissions of HC, CO, NOx and CO2. With I-type test cycle in GB 18352. 3-2005, the major HC emissions are in urban driving cycles, while CO emissions in urban cold cycle and NOx and CO2 in suburban cycles. In acceleration phase, all HC, NOx and CO2 emissions increase. [ABSTRACT FROM AUTHOR]