Farmer have their own knowledge and habits of using chemichal fertilizers in paddy,different of farmer behaviors will have an impact on they yield obtained. This study aims to determine farmer profile, farmers behavior in the use of chemical fertilizers and influencing faktors in paddy in Ketah Village Suboh Subdistric Situnbondo Regency. The location of the study was conducted in Ketah Village, this village is the second largest paddy producing in Suboh Subdistrict. The number of respondent used in this study were Galing 1 group of farmers. Data collected through interviews and observations which are analyzed descriptively using interval and rank spearman. The results of this study generally show that farmers behavior includes selection of fertilizer type, dosage, method of application, maxing of fertilizers, fertilizer time and fertilizer interval are categorized in good category with the acquisition of scores 97,18. Releted factors between farmer behavior in using chemical fertilizers and experience has very weak relationship category, farmers perception of chemical fertilizers has fairly strong relationship category, cosmopolitan and farming income have weak relationship category.