Antique china patterns are regularly or repeatedly used decorative patterns on porcelain. They do exist on porcelain for China's internal market as well as on export porcelain.
Examples of Chinese china patterns on export porcelain: Examples for the European market
Armorial porcelain (often similar design with different initials or coat-of-arms, etc.
Japanese market During the late Ming and early Qing dynasty predominantly red and green wares were exported to Japan. Many have the mark 吳須赤繪 (Wuxu Chihui) and were used exclusively for the Japanese market.
Southeast Asian market Frome the middle of the 19th century (Tongzhi reign) porcelain was made to order aspecifically for the (Malacca) Straits Chinese and their descendants. See Peranakan or Nyonya Porcelain.
Domestic market Scores of other patterns were in use for China's domestic market. Many related to history, mythology and traditional events. See Craft Motifs and Chinese Symbolism.
There are many more patterns found, both in domestic and export porcelain. In addition, Chinese china patterns can also be found in antique European porcelain (!). From the 17th to 19th centuries Chinese motifs and styles were copied by European porcelain producers to various degrees. The willow pattern is one example of a Chinese pattern that found wide use in European porcelain. "Chinoiserie" is a term that many will know... it designates European porcelain imitating Chinese patterns or styles.