Venture capital has invested in my project. If the venture fails, do I still need to return the venture capital money to him?

It depends on the form of the return of the investment amount when the specific investment is made. If the money invested is returned with interest, it is equivalent to borrowing money and must be repaid; If the investment money owns shares, if the investment fails, it does not have to be returned; If the return after investment is what technology patent you have, then the technology patent will be returned to the investor after failure.