Res judicata

No, the matter was not decided. 

Sir suit is decreed

If the suit is dcreed previously, then the matter already decided is barred under section 11, CPC. 
Only appeal lies in that case. 

Ok thanks

You have filed the subsequent suit impleading him as a defendant hence you cannot curtail his rights to defend his interests before the court of law.

It will not be termed as res judicata

I filed subsequent suit but he also filed counter claim

For his counter claim,can I take plea of res judicata 

It appears that the previous suit filed by him was dismissed for default and it was not disposed on merits, hence a fresh suit would not be barred by the law operating res judicata.

Hence his counter claim in your suit cannot be restricted for the reasons you state. 

No sir, suit is disposed on merit

In previous He had filed suit with plaint only but he didn't appear before court in oath box for cross, witness, evidence.

 On the basis of his pleading and our written statement, cross, witness and evidance suit was decreed on merit

If the suit was decreed on merits,  he cannot claim the same relief again in some other suit and the same cause of action would be considered as Res judicata. 

You can file a petition under order VII rule 11 to reject the plaint on the same basis