Titanium nitride synthesis has been investigated by sustaining a nitriding reaction of titanium powder compacts set in a closed vessel filled with liquid nitrogen. The characteristic features of the present combustion synthesis technology are the accelerating pressure in the vessel following sample heating through its combustion propagation, which results in a specific structure formation of the products. It has been confirmed in the present work that the pressure in the closed vessel was drastically increased (ca. 20 MPa s(-1)) by propagating the nitriding reaction. The product was shrunk and densified up to 99%. The product was identified as TiN0.87 without any trace of elemental titanium.