In this paper, we used the normal dataset ‘adult’ to compare the runing time, correct rate and error rate of c4.5 decition tree , native bayesion and native bayesion tree, with the data mining tool called weka. The result shows that: we can choose the NB Tree when the memory is big enough and the running time is undemanding; and choose natvie bayesion when the job should be done quickly; and the c4.5(j48) decision tree is an compromising approach.