A space-based orbit determination method using angle data is discussed in this article, which proposes the method of Vector Projection by unifing several present methods. It is convenient to be extended for other data types, and to build the based condition equations. Meanwhile, the correlative issues are studied, such as evaluation of initial iteration values, elimination of uniform solution and iteration acceleration. The numerical simulations in the end show that the new method is effective and swift in achieving a satisfying result.