How can Rock Lee stand on water? According to what I have seen, Rock lee isn't able to use ninjutsu nor genjutsu. However, it was shown that he can walk on water. Isn't walking on water a part of chakra control which he isn't able to perform? If he can control chakra then why not perform ninjutsu (doesn't need to be good at it, but at-least perform it.)

Also I am unable to understand how can he open the inner gates of chakra if chakra control is a problem for him?
Chakra Control

There are three things about Chakra Control.


Power Manipulation

This is my own term. It refers to how much Chakra you mold upon performing a jutsu. Quoting Wikia,


  In order to have good chakra control, a ninja should only mould as much chakra as they need to perform a given ability. If they mould more chakra than is needed, the excess chakra is wasted and they will tire out faster from its loss. If they don't mould enough chakra, a technique will not be performed effectively, if at all, likely creating problems in a combat situation.

Shape Manipulation


  Shape transformation deals with controlling the form, movement, and potency of chakra.

Nature Manipulation


  Nature transformation deals with changing the physical properties of chakra into an element. There is also the nature transformation of Yin and Yang, which deals with changing the ratio of spiritual and physical energies within chakra.



Rock Lee

What Rock Lee was incapable of is the last two, Shape Manipulation and Nature Manipulation. Most Ninjutsu requires at least one of these two. For example, Katon: Goukakyu no Jutsu (Fire Style: Fireball Jutsu) requires both shape manipulation (to make it into ball) and nature manipulation to give fire element to the jutsu. Rasengan requires shape manipulation to make it into ball shape, although in a whole different level than Goukakyu no Jutsu. Chidori requires nature manipulation to add lightning element to the jutsu.

It has been consistently shown that Rock Lee was unable to perform the last two in that he was never shown to use any jutsu that requires them. He, however, was shown to be able to perform Power Manipulation. This is evident in his use of the 8 Gates which requires him to flow chakra to various spots in his body.

Standing on water requires Power Manipulation, that is, creating enough chakra to cover his feet palms to keep him afloat. It doesn't require shape nor nature manipulation, thus explains how Rock Lee can stand on water.