The invention relates to a method of producing a railway construction protection alarm by utilizing a TDCS (Train Operation Dispatching Command System). The method comprises the following steps that (1) a construction protection site is set according to a construction position; (2) the running direction of a train is judged by a protection alarm logic processing module according to the change of TDCS station yard information, and protection alarm information of train approaching is produced in combination with the train position, the running direction of the train, a station yard signal equipment logic diagram and the construction protection site; (3) the protection alarm information is sent to a handheld alarm apparatus and an alarm prompt is produced; (4) the handheld alarm apparatus feeds back a condition that the alarm information is received according to the confirmation of a user. Compared with the prior art, the method has the advantages that the applicable range is wide, the investment of apparatuses is low, the alarm mistaking and omission can be effectively prevented, and the like.