Yes, they both need to apply for visas to China in advance through Chinese consulate in Dubai.
The requirements are as follows:
1. Original passport with blank visa pages and validity of more than 6 months;
2. UAE resident visa valid for more than 6 months. (Excluding GCC applicants);
3. Application Form which must be completed neatly and signed by the applicant him/herself;
4. One passport photo (and the photos of the applicant's accompanying persons included in his/her passport if they plan to travel with the applicant.);
5. Copies of the data pages of the applicant's passport and UAE resident visa.
6. A No-objection letter from the applicant's company stating his or her position, monthly or yearly salary;
The map of Chinese consulate in Dubai is put above on this page.