According to the relation between crystal structure and X-ray diffraction property, a new analyzer crystal-trihydroxymethylaminomethane (TAM) lias been prepared. Its was found to have a stable physico-chemical property with characteristics such as mechanical performance, linear expansion coefficient and X-ray diffraction property better than pentaerythritol (PET) crystal commonly used today. It has also been found that the TAM crystal is useful in practical applications.