In this paper, at first seven primary questions about universal gravitation are put forward as follows: Question No.1 Does universal gravitation pass on via gravitational energies? If it does, then what’s the formula to describe spreading of gravitational energies? Question No.2 How do gravitational energies give rise to gravitation? Question No.3 Given universal gravitation passes on through gravitational energies, then what is medium for spreading of gravitational energies? Question No.4 Do gravitational energies possess quantized nature？If they have, then what is quanta of gravitational energies? Question No.5 Given gravitational energies spread in form of waves, then do wave lengths of gravitational energies distribute themselves within an certain wave band? or just have an common wave length? If only having an common wave length, then how long is it? Question No.6 Why is universal gravitation attractive instead of repulsive? Question No.7 Why couldn’t all of matters shield off universal gravitation? and then, answers to them are made respectively one by one based on TCST.