This paper assumes an acquaintance with a new concept of time and gravity to provide the unified field theory. A new mathematical attempt intended to formalise the gravity current (𝐽 𝐴) and the speed of gravity signal (𝑉 𝑔) have been shown. The present author starts out from the"Theory of Original Gravity" [1] and presents to the unified field theory in a simple manner.This paper includes the formulations of quantum mechanics, pseudo-Riemannian manifold, fourgradient operator and Lorentz-invariant interval as a notable mathematical tools. 2 All of the ideas and matters presented in this paper are mainly based on quantum theory and manifold geometry.