Before revision:  In addtion, the PDF of cancellation positions can be fitted by the exponent function for both buy and sell orders  .
After revision:  In addtion, the PDF of cancellation positions can be fitted by the exponent function for both buy and sell orders . These two kinds of cancellation profiles seem universal for different stocks investigated and exhibit minor asymmetry between buy and sell orders. Our empirical findings shed new light on the order cancellation dynamics and pose constraints on the construction of order-driven stock market models .