LZ series of continuous whipstock is a deflection-making tool applied in petroleum domain, but which is not popularized in a wider scope for small diameter drilling of solid minerals being lack of the mature corresponding technology. According to the formation conditions in Lanling iron mine area and the causes of common phenomenon of borehole deflection, the paper introduced the working principles of LZ-73 continuous whipstock and 2 kinds of direction methods based on the application of whipstock in the mine and some experiences.