Diabetes Mellitus is metabolic and degenerative disease that is currently so feared by many people. Diabetes<br />Mellitus is on of non-communicable diseases which has become a public health problem, no only in Indonesia but<br />also in the world. The purposes of this research was to know the relationship of family support with preventive<br />behavior of Diabetes Mellitus in the village of Mancar district of Peterongan Jombang regency. This research<br />design was analitic cross sectional. The populations were all sufferers of Diabetes Mellitus in the village of<br />Mancar district of Peterongan Jombang regency in 2013 was amounted 37 people. The sample was 34 people.<br />Sampling technique used was sample random sampling. The variable in this research consisted of independent<br />variable that’s the family support and dependent variable that’s preventive behavior of diabetes mellitus<br />complication. The research instrument used was a questionnaire with data processing by editing, coding, scoring,<br />tabulating and statistic test used chi square. The results showed that’s almost entirely family support was negative<br />with total 26 respondents (76,5%), majority preventive behavior of diabetes mellitus complication was negative<br />amounted 21 respondents (61,8%). The test of chi square showed that the significant value of ï² = 0,001 &lt; ï¡<br />(0,05), so H1 accepted. The conclusion there is relation of family support with preventive behavior of Diabetes<br />Mellitus complication in the village of Mancar district of Peterongan Jombang regency.