Description  '''Life restoration of Yangchuanosaurus shangyouensis'''Yangchuanosaurus was a fairly large theropod. The type specimen of Y. shangyouensis had a skull 82 cm (2.7 ft) long, and its total body length was estimated at about 8 m (26 ft). Another specimen, assigned to the new species Y. magnus, was even larger, with a skull length of 1.11 m (3.6 ft). It may have been up to 10.8 m (35.4 ft) long, and weighed as much as 3.4 metric tons (3.7 short tons). There was a bony knob on its nose and multiple hornlets and ridges, similar to Ceratosaurus. It had a massive tail that was about half its length.
 ''Yangchuanosaurus shangyouensis skeleton displayed in Hong Kong Science Museum.'In June 1977, an almost complete skeleton of what was to be named Yangchuanosaurus shangyouensis was uncovered by a construction worker during the construction of the Shangyou Reservoir Dam in the Yongchuan District. Since then further skeletons have been recovered.
Gregory S. Paul (1988) regarded this genus as the same as Metriacanthosaurus, but this has not been supported.
*The original skeleton of Yangchuanosaurus shangyouensis is on display at the Municipal Museum of Chongqing, as is some material of Y. magnus. Another, recovered from Xuanhan County in Sichuan, is on display in the Beijing Museum of Natural History.