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I have 10 Trade but 8 is working. How to count the corruption

Depends on the ruleset. You have separate waste percentage for each type of your city's output ("corruption" is nothing but Trade waste) that is controlled by certain effects some of which are absolute and the another depend on government center distance; Courthouse effect then may reduce the waste amount. For a thorough guide, see wiki articles Math of Freeciv and Editing Effects and your ruleset code, ingame help gives some hints.

I m playing mp2 Caravel actually. My problem is to know math in civ. Your link is usefull. I hope i understand Thank you