(1) kev ua haujlwm ntawm kev ua cov thwj rau khoom loj yog siab, thiab yooj yim rau kev khiav lag luam, yooj yim kom paub txog kev kho vaj tse thiab kev siv tsheb. Qhov no yog vim qhov kev cuam tshuam yog nyob ntawm kev siv cov thwj cim thiab cov khoom siv thwj cim kom tiav qhov kev ua tiav, cov xovxwm thoob hlo li ib feeb mus txog ntau zaus, siab ceev ceev ib feeb mus txog pua pua lossis ntau tshaj ib txhiab lub sij hawm, thiab txhua stamping stroke tej zaum yuav tau txais cov khoom seem stamping
(2) thaum thwj cim, vim cov pwm ua kom qhov pwm thiab cov duab zoo meej ntawm qhov chaw seem, thiab feem ntau tsis ua kom zoo ntawm qhov chaw seem ntawm lub thwj cim, thiab lub neej ntawm lub pwm ntev ntev, yog li qhov zoo ntawm cov thwj cim yog khov kho, kev sib txuas lus zoo, nrog "tib yam nkaus" tib yam.
(3) stamping tuaj yeem ua tiav rau qhov loj thiab ntau hom, xws li me me rau lub sij hawm luv luv, loj mus rau lub tsheb ntev ntev, khawm qhov chaw, thiab lwm yam., Nrog rau cov lus pov tseg ntawm cov khoom pov tseg, qhov chaw muaj zog thiab nruj heev.
(4) thwj cim feem ntau tsis tsim cov khoom seem, cov khoom siv tsawg, thiab tsis xav tau lwm yam khoom siv cua sov, yog li nws yog ib hom khoom siv txuag, kev txuag kev txuag.