Based on an in-depth analysis of the Michelsonu2012Morley experiment, this study reveals that the moving speed of the Michelsonu2012Morley experimental apparatus cannot be superimposed on the propagation speed of light in "ether vacuum". Furthermore, there are design flaws in the Michelsonu2012Morley experiment. Therefore, the Lorentz's length contraction hypothesis and the Lorentz transformation have no experimental basis. A new experimental apparatus is proposed in this study to verify the existence of an "ether vacuum" and measure the absolute velocity of the Earth. The new experimental apparatus has an asymmetric optical path structure and double-slit interference. A laser source is divided into two laser beams, the first laser beam is always in the glass medium, and the second laser beam is partially in the glass medium and partially passes through an "ether vacuum". With theoretical analysis and calculation, it can be concluded that the number of interference fringes moving is 1.12 before and after the apparatus is stationary and moving at a constant speed of 100 m/s. To measure the absolute velocity of the earth in the "ether vacuum", the experimental apparatus is placed in different positions and directions and slowly rotated 180 degrees to observe the number of interference fringes moving. When the number of interference fringes moving is the maximum, the x-axis of the experimental apparatus is consistent with the direction of the absolute velocity of the earth. The absolute velocity of the Earth relative to the "ether vacuum" can be calculated with the number of interference fringes moving. The "ether vacuum" is an integral and indivisible absolute stationary space. Therefore, the inertial frames involved in the "ether vacuum" are not independent of each other. Neither Newton's classical principle of relativity, nor Einstein's general validity of the principle of relativity is applicable to inertial frames involving the "ether vacuum". The special relativity derived from the principle of invariance of the speed of light and the general validity of the principle of relativity is no longer true.