A method for processing a service crossing a master node of an optical burst transport network, comprising: selecting, by the master node, a processing strategy when assigning a bandwidth for a service requested by each node of the network within a present Dynamic Bandwidth Assignment, DBA, period; and managing, by the master node, a resource conflict caused by the service crossing the master node according to the selected processing strategy, and assigning, by the master node, the bandwidth for the service requested by the each node; wherein the service crossing the master node is a service that a route of the service needs to be directly connected to the master node; wherein selecting, by the master node, the processing strategy when assigning the bandwidth for the service requested by the each node of the network within the present DBA period comprises: selecting, by the master node, the processing strategy for the service crossing the master node according to at least one of a real-time requirement of a DBA operation or a DBA period, wherein the processing strategy comprises: a retention strategy or an elimination strategy; the retention strategy comprises: the service crossing the master node of a previous correlative frame is transmitted to a present frame set; and the elimination strategy comprises: the service crossing the master node is eliminated from the previous correlative frame set, wherein a frame set where the ith frame is located is defined as a previous correlative frame set to a frame set where the (i+N)th frame is located; wherein the DBA period is M times of a frame period, a ring period is N times of the frame period, and M is an integral multiple of N or N is an integral multiple of M, and selecting, by the master node, the processing strategy for the service crossing the master node according to at least one of the real-time requirement of the DBA operation or the DBA period, comprises: where M is slightly greater than N or M = N or M < N, selecting the retention strategy; and where M is much greater than N, selecting the elimination strategy; wherein when M is not greater than 8 times of N, M is slightly greater than N; when M is greater than or equal to 8 times of N, M is much greater than N. selecting, by the master node, a processing strategy when assigning a bandwidth for a service requested by each node of the network within a present Dynamic Bandwidth Assignment, DBA, period; and managing, by the master node, a resource conflict caused by the service crossing the master node according to the selected processing strategy, and assigning, by the master node, the bandwidth for the service requested by the each node; wherein the service crossing the master node is a service that a route of the service needs to be directly connected to the master node; selecting, by the master node, the processing strategy for the service crossing the master node according to at least one of a real-time requirement of a DBA operation or a DBA period, wherein the processing strategy comprises: a retention strategy or an elimination strategy; the retention strategy comprises: the service crossing the master node of a previous correlative frame is transmitted to a present frame set; and the elimination strategy comprises: the service crossing the master node is eliminated from the previous correlative frame set, wherein a frame set where the ith frame is located is defined as a previous correlative frame set to a frame set where the (i+N)th frame is located; wherein the DBA period is M times of a frame period, a ring period is N times of the frame period, and M is an integral multiple of N or N is an integral multiple of M, and selecting, by the master node, the processing strategy for the service crossing the master node according to at least one of the real-time requirement of the DBA operation or the DBA period, comprises: where M is slightly greater than N or M = N or M < N, selecting the retention strategy; and where M is much greater than N, selecting the elimination strategy; the service crossing the master node of a previous correlative frame is transmitted to a present frame set; and the elimination strategy comprises: the service crossing the master node is eliminated from the previous correlative frame set, wherein a frame set where the ith frame is located is defined as a previous correlative frame set to a frame set where the (i+N)th frame is located; wherein the DBA period is M times of a frame period, a ring period is N times of the frame period, and M is an integral multiple of N or N is an integral multiple of M, and selecting, by the master node, the processing strategy for the service crossing the master node according to at least one of the real-time requirement of the DBA operation or the DBA period, comprises: where M is slightly greater than N or M = N or M < N, selecting the retention strategy; and where M is much greater than N, selecting the elimination strategy; where M is slightly greater than N or M = N or M < N, selecting the retention strategy; and where M is much greater than N, selecting the elimination strategy; wherein when M is not greater than 8 times of N, M is slightly greater than N; when M is greater than or equal to 8 times of N, M is much greater than N.