The invention provides an OLT (Optical Line Terminal) logic network test method. The method comprises the following steps: first equipment sends a service flow to an ONU (Optical Network Unit); When the OLT equipment receives a service flow sent by the ONU in any network slice, the service flow carries and sends a first identifier and a second identifier to second equipment; Wherein the first identifier comprises an ONU identifier; Wherein the second identifier is a globally unique network slice user identifier allocated to each network slice; When the second equipment receives the service flow sent by the OLT, obtaining a first identifier and a second identifier carried in the service flow, determining whether the first identifier corresponds to the second identifier or not according to the configured corresponding relation between the first identifier and the second identifier, and if yes, determining that the network slice realizes isolation; Otherwise, determining that the networkslice does not realize isolation. The scheme can effectively determine whether each network slice realizes isolation or not.