In recent years， sewage source spray heat exchanger was widely used in sewage source heat pump systems with its higher heat transfer coefficient， easier operation and maintenance and less energy， etc. In this paper， we studied the direction arrangement of heat exchange tubes of spray heat exchanger. And the heat transfer coefficient， film coverage， effective area ratio has been studied through mathematical tools and CFD simulations and other means. The results showed that in the sewage-source heat pump project， when the engine room area is relatively small but highly space is sufficient， the vertical arrangement of spray heat exchanger tubes can obtain a good effect.