The purpose of this research was to study the mathematical achievement of students on problems solving in three aspects; 1) To compare the mathematical achievement of students between before and after the normal teaching method; 2) To compare the mathematical achievement of students between before and after teaching with Polya?s procedures; 3)To compare the mathematical achievement of students between  Polya?s  procedures and the normal teaching method.
 	The sample was 50 Prathomsueksa Four students in the second semester of the   academic  year of 2007 from Phitthayarungsi  School, Chonburi. They were divided into two equal groups, the control group and the experiment group. The research instruments  were the achievement test on mathematics and the mathematics exercises. The statistics used in data analysis were mean, standard deviation, and  dependent  t-test.
The results were as follows :
1. The students, achievement on mathematics problems solving of the control group after the normal teaching method was higher than before with the statistical significant level at .01.
2. The students, achievement on mathematics problems solving of the experiment group with Polya?s  procedures was higher than before with the statistical significant level at .01.
3. The students, achievement on mathematics problems solving of the experiment group  was higher than the control group  with the statistical significant level at .01.
