For improving our combat capacity on the sea, this paper uses the data envelopment analysis to evaluate the sea field training performance effectively. According to the factors of the sea field training of a regiment, this paper sets a evaluation index system which is practical and operational, adopts the C2R and BCC models to analyze the whole training situation of the regiment, which provides theory basis for excellent-choosing. Results show that this method can overcome subjective factors of traditional methods, makes the evaluation results more objectively and reflects the real situation of the sea field training better. But it still needs to consider other random factors, in order to ensure the feasibility and rationality.