Additionally, in the final structure, the  val on the C1-C2 bond is slightly higher than that on the C1-C5 and C4-C6 bonds, indicating that the C1-C2 bond is slightly stronger, which can also be confirmed by calculating the Laplacian bond order. This example demonstrates that the smooth variation in bonding characteristics during an organic reaction can be successfully revealed by tracing the change in the  val map, highlighting the significant value of visual analysis of  val . Reprinted with permission from Ref. . Copyright 2018 Editorial Office of Acta Physico-Chimica Sinica.