Our product, ZKYQ－45－35 series diving vacuum preloading equipment, has won smoothly the national patent in 2007, the patent number is 200720034808.7. It is the key equipment to soft clay foundation consolidated by vacuum preloading and reinforcement of soft foundation. Now, it has been used in the third stage of the wharf project, Miaoling, Lianyungang. Also, it can be used in the harbour, highway and airport and has a broad market.