In their meeting with the Malaysian government as well as airlines representatives here, which was thrown open to the media for the first time, the relatives called for the record details of the plane that was monitored on Malaysian military radars, Chinese state-run CCTV reported.
Some of the relatives said they plan to sue the Malaysian government and the airline for not sharing the information.
Initially, Malaysian officials denied the report but later confirmed it, virtually changing the course of the search operation from South China Sea to Andaman Sea, though it is yet to be established whether the plane was the Kuala Lumpur-Beijing MAS Flight MH370.
The airlines, which had put up the relatives of 154 Chinese passengers travelling by the missing flight at a hotel here, is currently holding three briefings a day for them.
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Some of them have already been flown to Kuala Lumpur.
Earlier, Chinese Foreign Ministry spokesman Hong Lei asked Malaysia to share accurate information so that the search operations can be coordinated better.
"The Malaysian side has done a lot after the incident took place. But at present the plane is still not found," he said, answering a barrage of questions from the media here.
"We call on the Malaysian side to shoulder the responsibility to coordinate all parties in search operations," Hong said, adding Malaysia should step up efforts.
"We asked Malaysia to report in timely fashion to share information found in relevant quarters," he said.
About reports that the plane flew for several hours as per data received by Rolls Royce which provided the engines to the missing plane, Hong said the engines send data not only while flying but also when the plane was on the ground.
"According to relevant company, the plane will send signals to a satellite every one hour and such signal not necessarily sent only when plane is flying, (it also sends signals) even after landing," he said.