Abstract: The embedded depth of retaining structure of pit satisfies not only the anti-heaving stability of pit bottom but also anti-overturning stability of retaining structure. Based on codes, the calculating difference of embedded depth was analyzed with the some methods including elastic method, arc-slippage method, arc-slippage method considered the horizontal brace force and empirical law of the code. Then the acceptable range of embedded depth was proposed considered the discreteness of soil mechanical property.