In this paper by using natural density real valued bounded sequence space $l_{\infty}$ is extented and statistical $l_{\infty}^{st}$ obtained. Besides the main properties of $l_{\infty}^{st}$, it shown that a Banach with norm produced help density. Also, there no matrix extension its sequences covers $l_{\infty}^{st}$. Finally, non-porous subset