In order to analyze the performance of ignition delay periodon F-T diesel engine, this paper focus on the regular of combustion pressure、max pressure increase ratio、exhaust emission temperature and oil consumption ratio on different condition changing with ignition delay period when the 0# diesel 、F-T diesel and the blend of the two oils were burned in a turbocharged and inter-cooler engine. The results show that the ignition delay period shorten with the F-T diesel ratio addition , F-T diesel decreased by 35% comparing with 0# diesel on the same condition; the maximum combustion pressure decreased by 2.1% to 6.3%; max pressure increase ratio rise slowly; the temperature of exhaust emission display upward trend, max addition is 8.4%;fuel economy slight increase.