when I enter in ship

after blosting oil tank cargo ( helicropter is coming ) from here i am not abel to through this level from long time any HELP please

Do you mean the wrecked aircraft carrier (level 2)? If so, you need to shoot down the rubber dinghy suspended at the top end of the aircraft carrier (across the wooden bridges), by shooting out it's chains. Then go down to it and drive off where the radar shows you.

BTW, wrong forum.

It's the last part of boat where you have to kill Crow (actually damage the heli enough to make it fly away.

If you search for crow or boat level you should be able to find the answer. But, check this Walkthrough thread.

But here are some SPOILERS.....

option 1 - plant bomb, run to front of boat and wait for explosion then run back go on top of the room where you got the bomb and use the mast for cover to shoot him down with rocket launcher (RL). You have to do it before the ship sinks though .

Dropping smoke bombs at your feet "may" make it easier. Also, assuming you have the RL before you got on the boat, you go up there and drop the RL and pick up the extra one in the cabin.
This way you'll have 4 more rockets if you need them.

Option 2 - Before you get on the boat. Drive down and park a jeep on the small island next to the wrecked boat. Then when you plant the bomb on the boat quickly jump off the back and swim to the island. drop smoke under the jeep and take out crow.

Option 3 - It's hard and may take quite a few tries but it's completely possible to get Crow. But if you had enough and just want to move on type "/map catacombs" in the console.