Wave Soldering is the process of soldering through hole components onto a PCB by passing the exposed leads of the components placed on a board over a wave of molten solder. The solder wave flows under the PCB board and applies solder to the leads of components placed on the PCB board.
As PCB supplier china knows that, it is primarily used to solder thru hole components on printed circuit boards. It is not usually used to solder surface mount components. If you are looking to solder surface mount components on a PCB, then other soldering processes like reflow soldering can be used.