Abstract: In order to obtain smooth and stable slopes and uniform fragmentation of rock after smooth blasting， the delay accuracy of electronic detonators and nonel detonators were compared and tested， on the background of the cutting excavation blasting project of Wenzhou Ring Expressway. Smooth blasting tests on parallel initiation network of electronic detonators and compound initiation network of nonel detonators were also carried out. The rock fragmentations after blasting with two kinds of detonators were contrasted， and the application of electronic detonator in smooth blasting and the fragmentation control was studied. The test results showed that the standard deviation， the range deviation and the error of delay time of electronic detonator are smaller than those of nonel detonator， but its delay performance is better than that of nonel detonator. After smooth blasting by electronic detonator， the slope surface is smooth with clear blasting hole. The rock mass obtained by blasting mostly concentrate in 10~450 mm with uniform fragmentation， which can better meet the needs of the project.

Key words: Blasting engineering, Electronic detonator, Nonel detonator, Smooth blasting