Well...
"Ok melth you are right but if necessarely you can have heimdall and his tower to protect you from this combo"
Not strictly a bad idea, as neither the Cataphract nor the Mounted Archer are exactly the best pick for dealing with buildings, but it probably will only work defensivelly, not offensivelly. And the Norse kind of need to be able to shift into offensive: If it gets into the Mythic age, even Heimdall defenses will still be lackluster compared to their Chinese counterparts.
"If he do fire lances I 'm not sure that they can beat age 3 heimdall towers because they are cheap and same range. If he does only fire lance norse have the best counter which is raiding cav."
... Sufficiently massed, yes, they can. Like its counterpart, the Destroyer of Atlantis, the biggest advantage of Fire Lances ( Other then being relatively more effective against units then most siege units sans the Ballista ) is that they are very cheap and easy to mass. a Heimdall tower would not be able to take down, say, ten Fire Lances before it falls( Assuming, obviously, it is unsupported ).
It is also worth pointing out that sending out Fire Lances without-Something-To support then is a all-around terrible idea and your opponent is very unlikely to do that unless he is really new into the game. Most opponents would support Fire Lances with Halberdiers predicting preciselly this kind of situation. Granted, the Norse have other ways to deal with this one combo, but still...
"So you can reach âge 3 and get some fire giants. And this giants can' t be attacked by ranged immortal!"
"Cant be attacked" would be overstating, though I will admit that Fire Giants outrange Immortals what makes then a decent pick against then... Compared to most other myth units, anyway. Actually, Fire Giants might be technically the most devastating unit the Norse have against the Chinese: They outrange almost anything on a Chinese army, they can defeat the Chinese heroes with little pain in 1v1 due to their sheer raw force, and most of the Chinese human units deal scratch damage to then. If the Norse can gather fifteen Fire Giants, the Chinese will have a hell of a headache actually surviving the incoming assault.
... There is a catch, though: It is really, REALLY hard, for the Norse to actually get out fifteen Fire Giants. Up until this point, the Chinese will be able to overwhelm then through sheer numbers, what is actually kind of a Chinese speciality anyway, with their great economy and population-efficient units.
"And you also have balistae that counter even cataphract I think."
Ballistae are sort of a decent pick against the Cataphract, actually, though I am unsure if they are cost-effective against then. However, that takes me to your next point...
"And chinese don't have any siege counter."
... Actually, they kind of DO. They dont have any unit that gets-Bonuses-Against siege units, correct. What they DO get, however, is the Scout Cavalry( A unit I personally consider to be underrated: In terms of cost-efficiency and population-efficiency, it is actually as good against archers and siege units as the Hippikon. It is really nothing more then a weaker but cheaper Hippikon with a anti-villager thrown in for some reason ), and the War Chariot( Essentially, it can be treated as a cheaper and faster but weaker version of the Egyptian War Elephant. Like the Egyptian War Elephant, it can easily beat infantry units, though not to the same extent as it nor as the Cataphract which should be the actual go-to anti-infantry for the Chinese to use. However, the primary advantage of the War Chariot over the Cataphract is that, like the War Elephant, it is also much more versatile, easily defeating other cavalry units and being capaeble against archers that are slower then it. ). Oh, and dont forget about the White Tiger.
[This message has been edited by Draco_Wolfgand (edited 05-29-2017 @ 08:12 AM).]