Federica Mogherini praised China's targets for gradually reducing its greenhouse gas emissions and said the sides should be able to agree on other goals at an upcoming bilateral summit.
"On climate change, let me say that the European Union appreciates very much the role that China has been playing and is playing," Mogherini told reporters in Beijing.
A unified EU-China approach will help make the Paris talks a success, something that is a "common joint responsibility," she said.
China is the world's biggest emitter and has pledged to level off carbon emissions by around 2030. That commitment has garnered widespread affirmation, although some experts say China's emissions need to peak much earlier to stave off major climate consequences.
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Mogherini addressed reporters during a break in talks with Chinese State Councillor Yang Jiechi, the government's senior foreign policy adviser.
Mogherini said the sides agreed on the need for a negotiated settlement to the conflict between Ukraine and Russia-backed separatists, and praised China's role in talks on a framework agreement over Iran's nuclear program.
Mogherini, a former Italian foreign minister, is making her first visit to Asia since taking over as the EU's high representative for foreign and security policy in November.
She also visited South Korea and met with President Park Geun-hye.