The Shenzhen Stock Exchange told membership securities and information service companies on Tuesday to improve the withdrawal system for listed companies.

According to a revision of the listing rules, shares that have been ordered to delist should be traded on a separate board for 30 trading days before the final withdrawal.

During the pre-delisting period, if the share's trading is suspended for a day, the period will be extended accordingly.

The stock code will not change after shifting onto the separate board. The daily limit for share price movement is up or down 10 percent.

The relevant securities companies and information providers must inform shareholders of a delisted companies operation information and trading status during the pre-delisting period.

All the preparation work should be finished by Sept 7, according to the Shenzhen Stock Exchange.