i need to go Xicheng Industrail Park , Hengli Town in Dongguan .

Generally speaking, it can be ok for you to get to both HK or Guangzhou 'cause there are direct transport from the HK Airport or Guangzhou Airport to Dongguan.
Upon arrival at Dongguan, you need go to Dongguan Bus Terminal Station to transfer to take Dongguan Dongbu Express to Hengli Town. After that, you can take a taxi to the Xicheng Industrial Park.
Don't worry. There are many hotels around Hengli.

thank you very much that mean if am arrival Hk airport have Bus from airport to Dongguan and after can take Taxi to Hengli town ?sorry if am ask any question cause this my first time

Yes, you can take a tax, but the fare must be so high. There is about 370 kilometers, and will cost you about an hour by taking bus to reach.