The invention discloses a connection survey system and method. The survey system comprises two Z-type tripods, reflecting boxes and glass sheets; the Z-type tripods are arranged at the top of a to-be-surveyed vertical pit and provided with a vertical line laser alignment instrument and a total station respectively, and the vertical line laser alignment instrument emits lasers with two colors; thetwo reflecting boxes are arranged at the bottom of the to-be-surveyed vertical pit; the glass sheets are arranged between one Z-type tripod and the vertical line laser alignment instrument as well asbetween the corresponding Z-type tripod and the total station. Through mercury layers in the reflecting boxes, an absolute horizontal plane is provided; through the total station and the lasers with two colors emitted by the vertical line laser alignment instrument, two gravity lines perpendicular to the mercury layers are obtained, in this way, a ground traverse point is introduced into the bottom of the pit, survey deviation is avoided, through the fact that light spots do not overlap since two-color refractive indexes are different, whether or not projecting light rays have atmospheric refraction is detected, accordingly, it is avoided that survey is conducted at in appropriate time, and survey errors are reduced.