To avoid the occlusion problem and the fat finger problem while manipulating mobile touch devices, researchers in HCI community have explored the area of mobile camerabased interaction which utilizes camera input instead of touch input. For mobile camerabased cursor manipulation, selection mechanisms may have an effect on users' pointing performance, and therefore worthy of study. In this research, we conducted a user study to explore how selection mechanisms influenced users' performance in mobile camerabased cursor manipulation and users' preferences. The quantitative results indicate that the users' performances of using two selection mechanisms (the button-based selection and tapping-based selection) are similar to each other from a statistical point of view. However, subjective feedback from the participants shows that the tapping-based selection is believed to be more comfortable and easy to use.