Ford sales in China fell 36.9% year on year to 752,243 in 2018, reflecting the overall market plunge.
Sales by the Changan Auto passenger joint venture fell 49.5% to 417,215 cars.
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Ford said this was due to most CAF products "near the end of their refresh cycle, excess stocks leading to large discounting and declining dealer profitability".
The Jiangling commercial vehicle joint venture's sales were off 9.9% to 263,582 vehicles.
It was better news at the Lincoln brand where volume was up 2.2% to 55,315. Ford brand imported vehicle volume slipped 14.3% to 16,131.
Ford China president Anning Chen described 2018 as "a challenging year" and promised 10 new products, satrting with the Territory this month, dealer network growth and sales and marketing organisation improvements.
Sales of new passenger vehicles in China plunged 19.3% year on year to 2.22m units in December 2018, the seventh consecutive month of decline, according to retail data released by the China Passenger Car Association.
