How could I use binary log as relay log? I has a full backup of MySQL, and binary logs from the time of starting full backup.Can I restore the data in another instance use replication like only start slave sql_thread; rather than mysql &lt; mysql-binlog.xxxx?
If the Slave is at the state of the start of the binlogs, then simply perform a CHANGE MASTER to point the Slave at the start of the binlogs.  POS can be either 0 or 4.  (In case you see either of those.)

At that point, the Slave will rapidly "catch up".