When US sells the Apache to Taiwan, will this pose a serious threat to China?

China currently has no attack helicopter comparable to the Apache. Taiwan is negotiating the US to sell them the apache for 2008 onwards. If Taiwan buys the Apache, this will upgrade their aviation capacities, would this impose a serious threat to our nation?

No. Apaches can not be used offensively across the strait.
They are mainly a threat to small landing craft and any armour that comes ashore. So they are a defensive purchase.

I think by the time Taiwan receives them all, PLA should have their latest WZ-10 in service, as well. But anyway, attack helicopters shouldn't be any threat to China.

You have to remember that seldomly spesific weapon systems are mented to fight against each others. Ofcourse there is some cases where this isen't true, like MBTs and Fighterplanes. But usually weaponsystems are mented to destroy some other non-related systems.

In this case the question is about attack helicopters. Despite how cool they look and sound, they are intended mainly to one or two roles, anti-tank and counter-insurgency. Altough some modern attack choppers have air-to-air weaponry to destroy other helicopters, all current attack copters are designed to be anti-tank platforms in the first place.
Thats the case with both WZ-10 and Ah-64 Apache. If Taiwan recives Apaches it's hardly a "treat" to china when the situation is what it is now. It becomes to threat if China tries to invade Taiwan, as the PLA amphibious assault force is extremely vunarable to aerial threats.
The awnser to this threat is not WZ-10. Its more flexible and capaple aidefence suite for the PLA amphibious force.

How much of an improvement would the Apaches offer over the Cobras in countering any amphibious landing?

Skywatcher said:

How much of an improvement would the Apaches offer over the Cobras in countering any amphibious landing?

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More armament, more capable target acquisition suite. That means better chances of engagement at a longer standoff range, minimizing risk to the helicopter itself.

The apache is a heavier attack helicopter. cobra 3000 LB vs apache 6000 lb of ordinance. 4 blade vs 2 blade and
either 2× Rolls-Royce RTM322 2241hp/2× General Electric T700-GE-701C 1890hp
vs 1× AVCO Lycoming T53-L-13 turboshaft 1100hp. basic cobra also lack helmet mounted night targeting system.

If the PLA only land chinese BMP then an upgrade to AH-1Z 4 blade super cobra is enough, if they bring type 99 than apache is the only good solution with its 16 hellfire missile.

dh19440113 said:

The apache is a heavier attack helicopter. cobra 3000 LB vs apache 6000 lb of ordinance. 4 blade vs 2 blade and
either 2× Rolls-Royce RTM322 2241hp/2× General Electric T700-GE-701C 1890hp
vs 1× AVCO Lycoming T53-L-13 turboshaft 1100hp. basic cobra also lack helmet mounted night targeting system.

If the PLA only land chinese BMP then an upgrade to AH-1Z 4 blade super cobra is enough, if they bring type 99 than apache is the only good solution with its 16 hellfire missile.

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Taiwan operates the Whiskey Cobra, which uses the same engines as the Apache's.

美國友邦 said:

would this impose a serious threat to our nation?

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As has been said here, there would be zero threat to China because they would be used defensively. It would help Taiwan if invaded by China, but that's a different kettle of fish.

Maybe someone can correct this, but I remember reading a news article a while ago that there was a large capsized ship off the coast of Taiwan. It was a hazard to shipping so the Taiwanese tried to sink it by "conventional" means. That didn't work so they supposedly sent two Apaches and fired Hellfires which didn't work either.