The purpose of this paper is to investigate the characteristics of human constitution adapting to environment. Human constitution adapting to climate zone is basically classified into four types: The $Af^{ominus}$ constitution adapting to warm-humid climate, the $Aw^{ominus}$ constitution adapting to warm-arid climate, the $Dw^{oplus}$ constitution adapting to cold-arid climate and the $Df^{oplus}$ constitution adapting to cold-humid climate. The ${ominus}constitution$ can be changed into a ${oplus}constitution$ by adapting to cold climate or by heredity combination with the ${oplus}constitution$. The ${oplus}constitution$ can be changed into a ${ominus}constitution$ by adapting to warm climate or by heredity combination with the ${ominus}constitution$. The four constitution types consequently can be classified into eight types: The $Af^{ominus}$ constitution, the $Af^{oplus}$ constitution, the $Aw^{ominus}$ constitution, the $Aw^{oplus}$ constitution, the $Dw^{oplus}$ constitution, the $Dw^{ominus}$ constitution, the $Df^{oplus}$ constitution and the $Df^{ominus}$ constitution. This study investigated the characteristics of fingers of people with these constitutions and confirmed that the fingers of the ${ominus}constitution$ man are longer, slender and cooler than the fingers of the ${oplus}constitution$ man.