Abstract: Elaborated here in the essay is the application of the TMCP (Thermal-Mechanical Control Process) technique to domestic seamless steel tube production,involving three aspects,i.e.,on-line normalization,on-line quench and on-line accelerated cooling. The issues concerning the application which need to be further improved are analyzed. And based on the analysis result,it is concluded that further efforts should be made without any delay in such fields as the experimental research of the on-line heat treatment process of the P110 OCTG,hi-grade linepipe and hi-pressure boiler tube,improvement of the inspection/measurement means and the TMCP facilities,and selection of proper TMCP process as per type of the mill plant.