The Shanghai Circuit has had its circuit license renewed after it passed the check yesterday, a month before the Chinese F1 Grand Prix.

Charlie Whiting, FIA race director, said he was satisfied with the renovation and maintenance of the Shanghai International Circuit in Jiading District after checking out the track yesterday morning in light drizzle.

The circuit license was signed later in the evening that permits the track organizers to host the Formula One race for the next three years, Shanghai Juss Event Management Co. Ltd, the local organizer of F1, announced yesterday.

The No. 1, No. 8 and No. 14 bends of the track were renovated recently. China will hold the Formula One race on the April 15-17 weekend.

Renovation work, including laying asphalt, covered 6,100 square meters of the circuit, including three turns and an 800-square meter speed-buffering zone to ensure the circuit will no longer be bumpy and the subsidence problem was solved, officials with project operator Shanghai No. 1 Engineering Co Ltd said last week.

Subsidence was found to be serious at turns No. 1, 8 and 14 last year, which caused obvious jolting when cars were passing through the corners during the race in the past years.

The site's engineering manager Sun Liang said the Shanghai circuit was designed with sharp height differences to add to the driving challenges and make races more exciting.

The designs adopted to facilitate the height differences cause subsidence to take place naturally, Sun said. By relaying asphalt, it is relatively easy to solve this, he added.

The Shanghai circuit was designed by Germany's Hermann Tilke.