tick systems ?

i know have the attribute to make the system execute order.

but how to make the tick drive system ?

 

Tick drive system? You mean calling systems on your own rate?

If yes, then check this post out: https://forum.unity.com/threads/update-interval.523628/#post-3625324

 

oh thanks . but look like the unity has not been finish .

 

Nothing in ECS is really. Best case is preview and demo. Can you use it for production? Sure. However you are in charge of filling in the gaps. 2019 looks more promising for features