He made the comments during a phone call with Francois Hollande, the French president, according to Chinese media reports.
President Xi is also believed to have offered “deep condolences” to Mr Hollande during their conversation yesterday.
“China resolutely supports France in maintaining its national security and stability and in attacking terrorism.”
And Li Keqiang, the Chinese Premier, expressed “strong outrage and condemnation” over the attacks.
But the China National Tourism Administration (CNTA) said around 1,300 Chinese tourists were in Paris on Friday.
A spokesman for the CNTA urged its bureau to follow the developments in the French capital closely.
Russia has reportedly killed hundreds of fanatics since Vladimir Putin ordered airstrikes against ISIS in September.
The terror group’s arms supplies are also said to have been cut off by relentless Russian bomber jets.
Washington and its allies have suggested Russia is seeking to prop up Bashar al-Assad’s regime rather than defeat ISIS.
But Putin recently hit back, saying his country wants to “contribute to the fight against terrorism”.