A method for inter-domain data interaction, comprising: respectively configuring, by a management apparatus, multiple models in a model group into multiple domains, wherein each model corresponds to a forwarder in the domain where the model is located; encapsulating, by a data collection apparatus, collected data in a designated message, and sending, by the data collection apparatus, the designated message to the forwarder corresponding to the first model in the model group, wherein the designated message carries indication information for indicating an address of the forwarder, and the indication information further comprises: the number of models that have not completed data processing; and determining, by the forwarder, whether the number of models that have not completed data processing is 0 in the designated message; in a case where the number of models that have not completed data processing is not 0, inputting, by the forwarder, the collected data in the designated message to the model corresponding to the forwarder for calculation, receiving, by the forwarder, a calculation result sent from the model corresponding to the forwarder, updating, by the forwarder, the designated message, and sending, by the forwarder, the updated designated message to the forwarder corresponding to a next model in the model group, so that the forwarder corresponding to the next model executes the operation of determining whether the number of models that have not completed data processing is 0 in the designated message; wherein the forwarder updates the designated message by subtracting 1 from the number of models that have not completed data processing, setting the address of the forwarder corresponding to the next model in the model group, and updating the collected data in the designated message according to the calculation result; in a case where the number of models that have not completed data processing is 0, sending, by the forwarder, the processed designated message to a policy server. respectively configuring, by a management apparatus, multiple models in a model group into multiple domains, wherein each model corresponds to a forwarder in the domain where the model is located; encapsulating, by a data collection apparatus, collected data in a designated message, and sending, by the data collection apparatus, the designated message to the forwarder corresponding to the first model in the model group, wherein the designated message carries indication information for indicating an address of the forwarder, and the indication information further comprises: the number of models that have not completed data processing; and determining, by the forwarder, whether the number of models that have not completed data processing is 0 in the designated message; in a case where the number of models that have not completed data processing is not 0, inputting, by the forwarder, the collected data in the designated message to the model corresponding to the forwarder for calculation, receiving, by the forwarder, a calculation result sent from the model corresponding to the forwarder, updating, by the forwarder, the designated message, and sending, by the forwarder, the updated designated message to the forwarder corresponding to a next model in the model group, so that the forwarder corresponding to the next model executes the operation of determining whether the number of models that have not completed data processing is 0 in the designated message; wherein the forwarder updates the designated message by subtracting 1 from the number of models that have not completed data processing, setting the address of the forwarder corresponding to the next model in the model group, and updating the collected data in the designated message according to the calculation result; in a case where the number of models that have not completed data processing is 0, sending, by the forwarder, the processed designated message to a policy server.