Cancer or COVID-19 virus can be serious harmful diseases to our human beings. However, by understanding how these disease will be formed, we may construct the corresponding statisticalcausalityregressionmodeloreventheartificialintelligenceone.Thismayhelpusdevelopthecor-responding drugs or vaccine. Indeed by applying the techniques as stated in one of my paper [11], one may even control the mutation or the evolution of the cancer or the COVID-19 virus whenever the Lorenz attractor or the Butterfly effects existing during the virus mutation process. This may be a breakthrough in the history of fighting against our human beings’ nature enemy — virus.