The cementitious materials in low water binder ratio cement based material (LWBRM) cannot hydrate completely after hardening, which can continue to hydrate with enough water entered, and the volume of new hydration products expanse, therefore, it will have a great influence on its durability.Through the water soaking test of neat paste specimens, the influence of water binder ratio, curing condition, soaking temperature on the continued hydration of LWCRM were analyzed in this paper, and the bound water was the main evaluation index.Results show that the bound water of pastes with 0.15, 0.20, 0.25, 0.30 water binder ratio after 90 d water soaking (20℃) increased by 8.86%, 9.87%, 8.02% and 9.87%, respectively.And the bound water of samples with 0.20 water binder ratio increased 9.87%, 25.22% and 28.32%, respectively, when the soaking temperature is 20, 40, 60℃.Whats more, the bound water of non-steam curing and steam curing sample with 0.20 water binder ratio increased 9.87%, 3.14%.With the increase of soaking time, the cracks on the surface of the 40 mm×40 mm=160 mm specimen increased gradually, it shows that the continued hydration with water for a high density LWBRM may have a downside on the development of its performance.