China plans to limit foreign investors' investment proportion in new projects for key components of new-energy vehicles to under 50 percent, the National Business Daily (NBD) reported.

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This is the first time that China's authorities clearly defined the investment proportion of joint ventures producing key components for new-energy cars, NBD said.

According to the guide co-issued by the National Development and Reform Commission and Ministry of Commerce, the key components include a wide range of car parts such as power battery, cathode material, battery management system, motor management system and drive motor.

The new guide will not only set a threshold for transnational corporations to establish new auto parts companies in China but also extend the restrictions to some traditional car parts.