Double Olympic boxing gold medalist Zou Shiming knows he has a lot to learn ahead of his professional debut next month, but the Chinese flyweight enjoyed the best possible education from hall of fame trainer Freddie Roach on Wednesday.

Having dominated the amateur circuit, where he also claimed three world championships, Zou will enter the paid ranks on April 6 when he faces Mexican Eleazar Valenzuela in a four-round bout in Macao.

Zou has prepared for the contest in the United States, and on Wednesday was put through his paces at Roach's famed Wild Card Boxing Club in Hollywood, California and sparred with WBA and WBO flyweight champion Brian Viloria.

Zou's amateur success was built on lightning quick hand speed, body swerving elusiveness and his ability to throw punches from all angles, but that style could come unstuck against heavy-punching professionals.

American trainer Roach, who has worked with some of the sport's greats including multiple world champions Bernard Hopkins and Manny Pacquiao, believes the 31-year-old Zou has room for improvement.

"For him to come into this venue like this, with Brian Viloria being his No 1 sparring partner and flyweight champion of the world and probably someone who he may be after some day, it's great for him and he has learned a lot," Roach said.

"He has a lot of potential but he still makes a lot of amateur mistakes. He has a lot of bad habits, but we are getting rid of them slowly. He's becoming a very good fighter."

Zou agreed he had a lot of adapting to do, but was looking forward to headlining the card, which also features Viloria defending his titles against Mexican Juan Francisco Estrada.

"I'm pretty good and I think I am ready for the first fight," Zou said.

"From the start I'm learning what to do inside the professional boxing ring. But, now I am getting comfortable with the rules here and I feel ready."

Demonstrating ferocious accuracy and a mean left hook as he pounded the gloves of Roach during the session, Zou said he was also concerned about improving his fitness.

"As an amateur we do all of our boxing in three rounds. As a professional, you have 12 rounds to show what you can do. This is a big challenge for my physical condition. I am working on this," the Chinese said.

"The same thing for amateur boxing and professional boxing is skills and I think that I have it."