The study was carried o.ut.in 2 communes of Vu Chan (interference), Lien Minh(control) are especially difficult communes, where many Dao people five in the district Vo Nhai of Thai Nguyen province. Objective: Evaluate changes in knowledge, attitude, practice practice (KAP) of hygiene and environmental pollution in the soil roundworm eggs of households in two communes of Dao extremely difficult Thai Nguyen. Subjects and Methods: Subjects of the study is the household Dao ((Standard both husband and wife Dao), intervention research, compare and then with chung.Kien prior knowledge, attitudes and practices on sanitation school (WES) of the Dao was assessed by interviewing 420 households Dao and quantified by scoring in principle correct answer is 2 points, but not fully correct 1 point, do not know or incorrect answer is 0 points. Based on trim 50 percent share of the total score of knowledge, attitude and behavior into two levels: + Right: or = 50 percent of the total points. + Not true: 50 percent of the total points. Tests Ascaris eggs in soil: Dang Van Ngu method improvements. Each family took soil samples testing 4 categories: In the house, in the yard, on the way to the latrine and latrines around. Evaluation criteria is the number of Ascaris eggs / kg soil 100 and or = 100 clean soil contaminated dirt. Evaluation of intervention effectiveness index (CSHQ) and effective interventions (HQCT). Results and conclusions:After 18 months of intervention, remote intervention: knowledge of environmental sanitation Dao 25.8 percent, 34.7 percent attitude, practice, up 4.8 percent compared to pre-intervention (p 0.05). Stay away from double distillation, KAP about WES also change but no statistically significant (p 0.05). KAP-effective intervention in society is relatively good, the impact of interventions knowledge of Sanitation of the Dao is 78.7 percent, sometimes 74.2 percent attitude and practice la la 96.0 percent. After the intervention of neutral density multi worms significant reduction in remote intervention, averaging 116.8 eggs / kg soil, especially for indoor acres only have 87.5 eggs / kg soil (p 0.05). Percentage acres Ascaris eggs in communal intervention dropped from 47.5 percent to 35.3 percent, while the proportion was far sometimes they are almost invariably. After intervention acres eggs efficiency is 21.0 percent and soil samples contaminated dirt is 11.1 percent.