The invention discloses a method for resuming transmission from a break-point for a reliable file receiving
system on the basis of a unidirectional broadcast network, which comprises the following steps: firstly,
slicing files to be transmitted according to the fixed size; secondly, attaching offset information and check information to each sliced file; thirdly, submitting a combined application data unit to a
reliable multicast layer to split the application data unit into data blocks at the layer; fourthly, coding the data blocks so as to generate corresponding redundant data blocks; and fifthly, transmitting all the data blocks in a scrambled mode by a
file transmission service terminal. When a user terminal receives the file, an
information index file of the file is created for recording the receiving situation of the file data blocks. When the file receiving is resumed after break, information
record files are checked to determine whether the transmission of the file needs to be resumed, and the transmission of the file is resumed according to the attached information. By adopting the method, the file can be received continuously from the break-point and the redundant and time-consuming write operation is skipped over to reduce writing times of a disk to protect the disk, thus the aims of reducing the I / O times and the CPU
occupancy rate and saving hardware resource of a receiving end is achieved.