Organisations like the tour operator Hong Kong Federation of Education Workers (HKFEW), which ran last year's trips, are competing for the contract to run tours from March 2014 to February 2016. But the student-led group Scholarism says it is worried about letting pro-Beijing organisations such as HKFEW continue to run the trips.
The group says students will be at risk of being brainwashed into believing Beijing's ideology.
Scholarism spokeswoman Agnes Chow says the operators of future tours should list their itinerary for the mainland trips so that students and their parents can make an informed decision.
Meanwhile, Charles Chan, a citizen who commented on the group's Facebook page yesterday, accused the government of misusing taxpayers' money by running such trips. The Education Bureau will pay 70 per cent of the expenses. Participants only have to pay HK$200 to HK$300.
Last year's trips took Primary Four to Secondary Three students to places in Guangzhou including Huizhou and Foshan. The two- to four-day trips focus on different themes from Chinese traditional architecture to green issues.