Abstract: Such changes of chemical properties as exchangeable hydrogen、exchangeable aluminum and total nitrogen of soil of Wuzhi Mountain of Hainan Province in the last half century were researched according to analyzed results of the soil samples of different time in 1954 and 2003 in this paper. The results indicated that exchangeable hydrogen and exchangeable aluminum of the soil of Wuzhi Mountain increased obviously in the last half century, and the total nitrogen and organic matters decreased obviously. According to furthered analysis of variance, the difference between the total nitrogen and organic matters had already appeared extremely remarkable level in the last half century, but the difference of exchangeable hydrogen and exchangeable aluminum have not appeared remarkable level.