Several effective routes to decrease the ignition energy of semiconductor bridge(SCB) were summarized based on the analysis of the characteristics of SCB,the ignition mechanism,the properties of charge and the charge conditions. These routes will be: (1) choosing small size SCB (23 μm(L)×67 μm(W) ×2 μm(t)); (2) choosing lead 2,4,6-trinitroresorcinate(LTNR) as ignition charge of SCB; (3) controlling the size of granule below 5 μm; (4) pressing the charge at a pressure above 30 MPa; (5) adding the fine Zr powder; (6) using G10 as the shell material of charge.