Geely's engine achieves a thermal efficiency of up to 46.1%, according to a product certificate issued by the government-owned CATARC Huacheng Certification Co.
Geely said this was among the highest in the world, and would reduce fuel consumption and extend driving range.
The new models will be launched for Geely Auto's Galaxy series and its Lynk & Co brand.
Plug-in hybrids are the fastest growing fuel-type sector in China thanks to their affordability, and competition in the sector is intensifying.
BYD on Tuesday launched two hybrid sedans equipped with its new hybrid tech, priced from 99,800 yuan (USD 13,800).
BYD said the new hybrid tech enables fuel consumption on depleted batteries of 2.9 litres per 100 km under New European Driving Cycle tests, with a thermal efficiency of 46.06%.
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