Cement Rotary Kiln process, the intensity level is to evaluate an important indicator of the strength of the cement, but also an important parameter than cement concrete mix design.Including cement compressive strength and flexural strength in two ways. Stability is an index indicating whether the cement hardened cement paste after uneven volume changes in the setting and hardening process, always accompanied by a certain volume change, if uneven deformation of cement or cement hardening after large deformation, will deformation of the concrete elements, expansion, causing severe cracking, thus affecting the quality of concrete.