The utility model discloses a slot type ecological isolation takes terraced fields in xeothermic river valley district, this terraced fields are from adjacent on, down the lower of the earth steps between the terraced fields up is the cascaded ecological bag that stacks in proper order in the take the altitude, lower ecological bag is on adjacent to the height between the ecological bag of the superiors, down between the terraced fields distance 13-12, be the vegetation slope from the ecological bag of the superiors upper surface to adjacent last terraced fields, the slope <= 45, the ecological bag inner chamber is matrix, set up at least one basin under in the terraced fields, the last port of basin and the field face parallel and level of this time terraced fields. The utility model discloses cascaded ecological bag structure is adopted to earth steps lower part between the adjacent terraced fields, makes the earth steps basis between terraced fields firm, can bear the slope part on upper portion well, has overcome not enough that earth steps between the current terraced fields in xeothermic river valley district easily wholly glided. Plant the vegetation on earth steps vegetation slope and the exerted ecological bag in lower part surface, enable earth steps constitution ecological isolation area between terraced fields, form and beautify ecological landscape.