I'm getting no spark on my 94 honda civic I've changed coil ,plugs,wires , cap,rottory button

If the CEL comes on and goes off normally, replacing the Ignition Control Module (ICM) should solve the problem:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

If the problem persists, the internal distributor sensors (CKP, TDC, and CYL) are likely bad. In this case, replace the distributor with a genuine Honda housing, reusing your new ICM and coil.