Gross profit was $16.9m, compared to $10.4m during the fourth quarter last year.
Revenues were $104.3m, representing a 6.9% increase compared to the fourth quarter of 2009.
"We are pleased to see that the strategic actions taken over the past several quarters have helped China Sunergy benefit from the improving demand environment," says chief executive officer Stephen Zhifang.
"In the coming months we will integrate our solar cell manufacturing expertise with our new module production capabilities, to ensure we continue to offer industry leading solar products to our global customers."
