The utility model relates to a synthetic structure escape canal of concrete grid loose -stone belongs to farmland drainage engineering's escape canal technical field, synthetic structure escape canal of concrete grid loose -stone mainly include concrete longeron, concrete crossbeam, concrete sloping, concrete floorbar, the loose -stone ditch body, geotextile bed course, the escape canal is trapezoidal, the open drain constitute the escape canal frame by vertical, horizontal, slant concrete grid, the geotextile bed course is spread to the bottom in the grid frame, the riprap rock is filled on the top layer, the utility model discloses an escape canal is in the surface water of getting rid of the rainfall production, and the groundwater accessible loose -stone ditch body in the soil is got rid of fast, and reducing underground water level reaches quick water drainage, arranges the purpose of steeping. The utility model has the characteristics of simple structure, construction convenience, the water drainage, to arrange the stain quick, to the basic strong adaptability of weakness etc.