Packet transport network (PTN) capacity distribution method with limited network resources

The invention relates to a packet transport network (PTN) capacity distribution method with limited network resources. The PTN capacity distribution method with limited network resources includes: step one, whether old business allowing routes to be changed and existing in network is judged, if the old business does not exist, only new business is sorted; if the old business exists, an original state of the network needs to be recorded, resources configured by the old business allowing changing in the network are released, the old business is used as the new business to be recalculated; and step two, and routes and link capacity are distributed to the business one by one according to business sorting.