Cross-border crowd-funding ought to be the development trend when the domestic internet industry's scale development has come to the critical point. Presently China should build the legal mechanism of cross-border crowd-funding to prevent the awkward situation of practice starting off before legislation. The major problem to build the legal mechanism of China's cross-border crowd-funding is that there has been no transcendent legislations of other countries and regions, the legal nature of crowd-funding's noumenon is not quite sure, the credit investigation system has not been integrated with the international community, and the development of cross-border internet financial regulation mechanism is immature. We can carry out concerning foreign crowd-funding business in China and carry out cross-border crowd-funding of donation to carry out cross-border crowd-funding business increasingly. Meanwhile, we should accelerate the speed of building the legal mechanism of cross-border crowd-funding to realize legislation's supply-side guiding function to practice.