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China's work safety administration said experts will inspect all of the country's showcase bullet train lines following a crash last month that killed 40 people.
The administration's spokesman, Huang Yi, said in remarks seen on the agency's website that authorities were still trying to determine who was responsible for the disaster.
He said a report is due to be presented to China's top leaders in September.
Meanwhile, state media reported that a toddler orphaned by the crash who was rescued nearly a day later was moved to Shanghai to help her recover from severe injuries to one of her legs, after relatives appealed for better help for the girl.
