The evolution of the birth rate of SNe Ia for a single starburst of 10¹¹M_⊙ and Z = 0.02. Solid, dashed, and dot-dashed lines are from SD + DD, SD, and DD channels, respectively. The results for the SD channel are from Wang et al. (2009) and Meng & Yang (2010a) including the WD + He star, WD + MS, and WD + RG channels, while those for the DD channel are from this paper. The circle is from Mannucci et al. (2005), the filled circles are from Totani et al. (2008), stars are from Maoz & Badenes (2010), squares are from Maoz et al. (2010), and triangles are from Maoz et al. (2011). Top: α_CE = 1.0. Bottom: α_CE = 3.0.