The invention relates to the technical field of network communication, and particularly relates to a gray release method and device. In order to solve the problem that in the prior art, the workload is enormous due to a control rule change, and gray release cannot be controlled flexibly and dynamically, the embodiment of the invention provides the gray release method and device. The method comprises the steps of obtaining a transaction request and matching a corresponding control rule according to a service type in the transaction request; preprocessing the control rule, thereby obtaining a rule template; sending the rule template to the rule engine for processing, thereby obtaining a gray release range; and controlling the gray release according to the gray release range. The purpose of controlling the gray release dynamically can be realized through a configurable control rule and a rule engine.