This study knowledge, attitude, behavior and health impact of the use of chemical pesticides, farmers markets Wiset Chai Chan district. Ang Thong The objective To study the knowledge, attitudes, behaviors, personal health impact. And the relationship between personal knowledge, attitudes and behavior of farmers who use chemical pesticides. The impact on the health of farmers using chemical pesticides. A descriptive study Sectional The samples were studied by sampling multiple layers (multi - stage sampling) 45 Number of people collecting data using questionnaires. The statistical analysis using the SPSS software by descriptive statistics and correlation analysis using Spearman Rank Correlation statistics and Chi-Square Test, x ^ 2.