NOVELTY - Single-crystal production workshop of a Bridgman method comprises a plate which is uniformly distributed with multiple holes on top of the production workshop. Each hole on the plate is respectively connected to top of a supporting plate corresponding to the branched gas pipe. The pipelines of the multiple branched gas pipes of top plate have same length and same inner diameter, which are uniformly distributed on floor of workshop bottom. Each hole on floor is connected to a support board. The structures located at top and bottom of top plate and floor plate surface are parallel to each other.    USE - The single-crystal production workshop of a Bridgman method is useful for discharging polluted air and maintaining quasi-steady state in geothermal field.    ADVANTAGE - The workshop is a substitution for temperature field air exchange device, and it is started without disturbing the workshop air field.    DETAILED DESCRIPTION - Single-crystal production workshop of a Bridgman method comprises a plate which is uniformly distributed with multiple holes on top of the production workshop. Each hole on the plate is respectively connected to top of a supporting plate corresponding to the branched gas pipe. The pipelines of the multiple branched gas pipes of top plate have same length and same inner diameter, which are uniformly distributed on the floor of the workshop bottom. Each hole on the floor is connected to a support board corresponding to the branched gas pipes. The branched gas pipes have same length and same inner diameter. The structures located at top and bottom of the top plate and floor plate surface are parallel to each other, where each enantiomeric structure on upper and lower surface are in opposite position. The workshop comprises a single extract ventilator for discharging poisonous polluted air. The workshop further comprises a single extraction port of an air inlet and a fan with many branched gas pipes to discharge the remaining poisonous polluted air.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the single-crystal production workshop of a Bridgman method.